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Comparison of rifaximin and lactitol in the treatment of acute hepatic

Comparison of rifaximin and lactitol in the treatment of acute hepatic
Comparison of rifaximin and lactitol in the treatment of acute hepatic

Comparison of rifaximin and lactitol in the treatment of acute hepatic encephalopathy:results of a randomized,double-blind,double-dummy,controlled clinical trial q ,qq

Antoni Mas 1,*,Juan Rode

′s 1,Lourdes Sunyer 2,Lu?′s Rodrigo 3,Ramon Planas 4,Victor Vargas 5,Llu?

′s Castells 5,Dolores Rodr?′guez-Mart?′nez 6,Conrado Ferna ′ndez-Rodr?′guez 6,Ignasi Coll 7,Albert Pardo 8,

the Hepatic Encephalopathy Cooperative Group from the Spanish Association for the Study of the Liver ?

1

Liver Unit,Institut de Malalties Digestives,Hospital Cl?

′nic,Institut d’Investigacions Biome `diques August Pi i Sunyer (IDIBAPS),University of Barcelona,Barcelona,Spain 2

Laboratorios Zambon S.A.,Barcelona,Spain 3

Hospital Central de Asturias,Oviedo,Spain 4

Hospital Germans Trias i Pujol,Badalona,Spain 5

Hospital Vall d’Hebro

′n,Barcelona,Spain 6

Hospital Xeral Cies,Vigo,Spain 7

Hospital Mu

′tua de Terrassa,Terrassa,Spain 8

Hospital Universitario de Canarias,La Laguna,Tenerife,Spain

Background/Aims :The ef?cacy and safety of rifaximin in comparison with lactitol in the treatment of acute hepatic encephalopathy was assessed in a prospective randomized,double-blind,double-dummy,controlled trial.

Methods :A total of 103patients with grade I–III acute hepatic encephalopathy were randomized to receive rifaximin (50patients,1200mg/day)or lactitol (53patients,60g/day)for 5–10days.Changes in the portal-systemic encephalo-pathy (PSE)index on entry and at the end of the study were used to evaluate the ef?cacy of the two therapies.

Results :Both groups were comparable before treatment with regard to demographic data and characteristics of the hepatic encephalopathy episode.The global ef?cacy of both therapies was similar:81.6%in the rifaximin group and 80.4%in the lactitol group showed improvement or total regression of the episode.A signi?cantly better evolution of the PSE index was observed in the rifaximin group,due to a greater effect of rifaximin in two components of the index:EEG abnormalities and ammonia levels.No serious adverse events related to either treatment were found during the study.

Conclusions :Rifaximin may be considered a useful and safe alternative therapy to lactitol in the treatment of acute hepatic encephalopathy in cirrhosis.

q 2002European Association for the Study of the Liver.Published by Elsevier Science B.V.All rights reserved.Keywords :Hepatic encephalopathy;Rifaximin;Lactitol;Cirrhosis

1.Introduction

Hepatic encephalopathy (HE)is a well known neuropsy-chiatric syndrome occurring in patients with either acute or chronic liver diseases,and it is characterized by distur-bances in consciousness,personality and intellectual capa-city,high blood ammonia levels,altered neuromuscular activity and abnormalities in the electroencephalogram (EEG)[1].

The high ammonia plasma levels due to impaired meta-

Journal of Hepatology 38(2003)

51–58

0168-8278/02/$20.00q 2002European Association for the Study of the Liver.Published by Elsevier Science B.V.All rights reserved.PII:S0168-8278(02)00350-1

https://www.doczj.com/doc/d711033846.html,/locate/jhep

Received 18January 2002;received in revised form 20September 2002;accepted 25September 2002q

Presented at the XIVth Annual Meeting of the Spanish Association for the Study of the Liver,Madrid,1999.qq

The authors declare that they received a grant from Zambon S.A.(Spain)and also from Alfa Wassermann Pharmaceutical Company (Italy)who provided the rifaximin tablets and lacitol sachets,active compounds and placebos.?

Investigators and participating centers are listed in Section 5.

*Corresponding author.Liver Unit,Hospital Cl?

′nic,C/Villarroel,170,08036Barcelona,Spain.Tel.:134-93-227-54-99;fax:134-93-451-55-22.

E-mail address:amas@medicina.ub.es (A.Mas).

bolic function in cirrhosis play a central role in the multi-factorial mechanisms causing HE[2].Ammonia production occurs mainly in the bowel due to degradation of nitrogen-ous compounds by aerobic and anaerobic bacteria[3,4].The therapeutic approach to HE is aimed at decreasing ammo-niagenic substrates and at inhibiting ammonia generation,as well as at reducing its intestinal absorption and facilitating its elimination.This includes a reduction of proteins in the diet,the administration of non-absorbable disaccharides, and/or the administration of non-absorbable antibiotics[4–7].

At present,the pharmacologic treatment of choice in patients with HE is the administration of non-absorbable disaccharides(lactulose or more recently lactitol)[4]. Neomycin,a poorly absorbed aminoglycoside antibiotic, has shown similar ef?cacy as lactulose in the treatment of HE[8],but the possibility of side effects(oto or nephro-toxic)attributable to its absorption have made its use less frequent[4,7,9].

Rifaximin,a non-absorbable rifamycin derivate,exhibits wide in vitro and in vivo antimicrobial activity against both aerobic and anaerobic gram-positive and gram-negative microorganisms[10–12].Furthermore,unlike other rifamy-cins,rifaximin is practically unabsorbed by the gut[13], thereby allowing the antibiotic to reach high concentrations in the intestinal tract and to remain in the feces in its active form[13].Due to these properties(high antibacterial activ-ity with null absorption),rifaximin has been used for the treatment of HE in a non-controlled basis or in trials includ-ing a relatively low number of cases[14–19].The data from these studies suggest that rifaximin decreases ammonia plasma levels and improves the symptoms related to HE in cirrhotics.

The aim of this prospective randomized,double-blind, double-dummy,controlled clinical study was to assess the ef?cacy and safety of rifaximin in comparison to lactitol in the treatment of cirrhotic patients with grade I–III acute or recurrent HE.

2.Patients and methods

One hundred and three consecutive cirrhotic patients with an acute HE episode,diagnosed in13hospitals in Spain from November1995to December1997,were enrolled in the study.All patients showed clinical, psychometric and electroencephalographic evidence of grade I–III HE of less than2days duration and an portal-systemic encephalopathy(PSE) index higher than zero,as described by Conn[8].Informed consent was obtained from close relatives;if mental status improved,patients them-selves were also requested to give their consent.The study was conducted in compliance with Spanish law,in accordance with the ethical guidelines of the Declaration of Helsinki,and was reviewed and approved in1995by the Human Research Committee of each hospital and also by the Spanish Regulatory Health Authorities.The sample size was based on the results obtained in published studies,assuming that lactitol will be successful in 80%of patients and rifaximin in95%;with120evaluable patients(60per group)the study will have an80%power to detect signi?cant differences between treatments using a5%signi?cance level.However,the study was designed to?nish at the end of1997,and therefore the number of included patients was slightly smaller.

Exclusion criteria were:major psychiatric illness,chronic renal and/or respiratory insuf?ciency,intercurrent infections,known hypersensitivity to rifamycin antibiotics and/or to disaccharides,patients having received treat-ment with sedatives or antibiotics within7days before inclusion,pregnant or lactating women,and patients who did not ful?ll protocol requirements. After hospital admission,patients underwent detailed physical,neurolo-gical and psychometric assessment,with particular note being made of their mental status,the severity of asterixis and their performance in the number connection test(NCT)type A.A venous blood sample was taken for hema-tological,biochemical,and blood ammonia level determinations and an EEG was performed.Patients were then randomly assigned to one of the following two treatment groups:

Rifaximin group:every8h patients received two200mg tablets of rifaximin and20g of lactitol placebo with an identical appearance, smell and taste as the active compound of lactitol given to the other group.

Lactitol group:patients received20g of lactitol three times a day(every 8h)and two tablets of rifaximin placebo,externally indistinguishable from the rifaximin tablets administered to the other group. Randomization was carried out using serially numbered,sealed,opaque envelopes strati?ed by the center.All experimental material was divided into‘patient-units’characterized by a label containing the previously assigned randomized number.Treatment was administered for a minimum of5days,or for a maximum of10days if the HE episode was not resolved by day5.In both groups the content of20g of lactitol was dissolved in100 ml of water and medication was given orally or via nasogastric tube if required.If the patients presented severe diarrhea during the treatment period,the dosage of the sachets was reduced and adjusted to obtain two soft stools per day.Dietary protein intake was restricted to20g/day in all patients on the?rst day of therapy,and,on evidence of sustained improve-ment in mental status,protein intake was gradually increased up to0.5g/kg body weight per day.Neurological evaluation and NCT were performed daily,and blood chemistries,including ammonia,and EEG were repeated at the end of the study period.

No patient received any drug that could potentially interfere with the progression of the HE,and thus,the evaluation parameters during the study treatment period.In cases of de novo systemic bacterial infection patients were empirically treated with i.v.cephalosporins,being thereafter modi?ed as required.

The therapeutic effects were analyzed according to the changes in the PSE index.Brie?y,this index is calculated taking?ve components into account:mental status(weighed by a factor of three),the presence and intensity of asterixis,the time taken to do NCT,EEG abnormalities,and blood ammonia levels.Depending upon the severity of the abnormalities in each component0to4points are assigned.The PSE index is the ratio between the points obtained and the maximum possible points(28in the case that all the parameters may be explored)[8].An extensive description of this index has recently been published[19].

The assessment of the clinical results was estimated as follows:resolu-tion was considered as blood ammonia levels decreased to normal values and disappearance of the HE clinical syndrome during the study;improve-ment was established as a reduction in initial blood ammonia levels and improvement in the HE clinical syndrome as in passing to a lower stage,or as a signi?cant decrease in the PSE index;unchanged was determined when the HE clinical syndrome had not improved,with the patient remaining in the?rst stage of HE,and blood ammonia levels had not decreased after treatment;or failure,being an increase in the blood ammonia levels or an increase in the PSE index observed at the end of treatment,and/or with a shift to a higher stage of HE.

Any adverse event was recorded specifying the time of onset,the dura-tion,the severity and the relationship to the test medication.Full blood cell count and plasma biochemistry pro?les were carried out to evaluate toler-ability at the start and at the end of the study.

A.Mas et al./Journal of Hepatology38(2003)51–58 52

2.1.Statistical analysis

All data documented and checked at the centers were entered twice by independent persons.The statistical evaluation was performed by Clever Instruments(Barcelona,Spain),using a statistical package(SPSS),and ef?cacy analysis was conducted on an intention-to-treat basis,including all patients with at least one ef?cacy assessment after the basal visit.Safety analysis was conducted including all patients enrolled in the study.Data were subjected to descriptive and inferential analysis with inter-and intragroup comparisons.

Demographic data,as well as baseline characteristics,were checked for normal distribution(Kolmogorov–Smirnov goodness of?t test)and homo-geneity(C variances test)and were analyzed by parametric(chi-square test or Fisher’s exact test;Student’s t-test)and non-parametric(Mann–Whitney U-test)tests as applicable.The frequency of patients in the two treatment groups with an improvement in the HE,determined by passage to a lower stage in the mental state score,was compared by a chi-square test.The values of the HE ef?cacy index calculated for the two treatment groups were submitted to a Mann–Whitney U-test.The mean values of blood ammonia levels,registered at baseline,on day5and at the end of treatment in the two treatment groups and of the PSE index were not normally distributed and were submitted to a Mann–Whitney U-test.Other variables of ef?cacy(asterixis,NCT,and EEG values)were analyzed according to their parametric or non-parametric tests.Adverse events were collected in frequency tables and the two groups were compared by the chi-square test (or Fisher’s exact test).Laboratory data were assessed during and between treatments by McNemar’s test and Fisher’s exact test.Statistical tests were conducted as a two-sided alpha level of0.05.

3.Results

After randomization,50patients were assigned to receive rifaximin(33males and17females,mean age of61.6^9.7 years)and53to receive lactitol(39males and14females, mean age of62.9^10.6years).Of the103patients enrolled,15(14.6%)discontinued the study:11withdrawals were due to inef?cacy(six patients in the rifaximin group and?ve in the lactitol group)and four were due to intoler-ability(two patients in each group).The mean length of treatment was5.65days in the rifaximin group and5.75 days in the lactitol group(P?NS)

Table1reports the demographic and clinical data,as well as the characteristics and diagnosis of the HE episode of patients on entry to the study.Statistically signi?cant differ-ences were only found between the two groups with respect to height(P?0:024)and to the percentage of patients who presented ascites(P?0:04).

The baseline characteristics of the HE episode are

A.Mas et al./Journal of Hepatology38(2003)51–5853 Table1

Demographic and clinical data of patients with acute or recurrent HE at randomization a

Rifaximin(n?50)Lactitol(n?53)Two-tailed P value b

Sex(%)(male/female)33(66)/17(34)39(73.6)/14(26.4)0.4016(1)

Age(years)61.59(9.74)62.92(0.56)0.510(2)

Weight(kg)67.39(10.44)69.24(11.77)0.464(2)

Height(cm)163.19(7.43)167.13(7.23)0.024(2)

Alcohol addiction:n(%)

Addicted7(14)9(17)

Ex addicted24(48)17(32.1)0.2526(1)

Non-addicted19(38)27(50.9)

Cirrhosis etiology:n(%)

Alcoholic25(50)24(45.3)

Post-hepatitic15(30)22(41.5)0.4089(1)

Other10(20)7(13.2)

HE:n(%)

First episode25(50)25(47.2)

Previous episodes24(48)28(52.8)0.5429(1)

Other1(2)0(0)

HE with:n(%)

Portocaval anastomosis8(16)5(9.6)0.3337(1)

Ascites24(48)35(67.3)0.0483(1) Splenomegaly22(44)23(44.2)0.9812(1)

Jaundice28(56)28(53.8)0.8270(1)

HE precipitating factors:n(%)

Protein overload1(2)1(1.9)

Bacterial infection2(4)2(3.8)

Gastrointestinal bleeding5(10)7(13.2)

Dehydration5(10)0(0)0.0618(1)

Constipation11(22)5(9.4)

Unknown10(20)22(41.51)

Other16(32)16(30.2)

a Values of qualitative variables are expressed as number(percentage of patients)and data of quantitative variables as mean(SD).A normal distribution test (Kolmogorov–Smirnov goodness of?t test)was applied to continuous variables:age(two-tailed P?0:1264);weight(two-tailed P?0:7816);and height (two-tailed P?0:6474).These parameters were normally distributed.

b(1)Chi-square,Pearson test;(2)Student’s t-test for equality of means.

summarized in Table2.Signi?cant differences were only found between the two groups in relation to the mean stage of the NCT(P?0:03).However,no statistically signi?cant differences were found in relation to this variable when measured as seconds.

A clear improvement was observed in the grade of HE and in the neurological,neuropsychiatric and psychometric para-meters as well as in ammonemia levels following treatment with rifaximin and lactitol,showing a signi?cantly progres-sive improvement in both groups(Table3).In spite of a better response in all these parameters in rifaximin treated patients compared with those treated with lactitol,the differences observed were statistically signi?cant only for HE grade, ammonemia levels and the percentage increase in EEG counts per second at the end of treatment(Fig.1).

The overall PSE index,which was similar in the two groups before treatment,decreased more progressively in the rifaximin group than in the lactitol group(Fig.2).The difference registered post-treatment was statistically signif-icant(P?0:01),with the rifaximin group showing a lower PSE index.

Finally,in regard to the global assessment of ef?cacy registered at the end of treatment,both groups showed a similar clinical ef?cacy without signi?cant differences. After grouping the responses into two classes,resolution/ improvement versus unchanged/failure,the results were very similar in both groups:81.6%versus18.4%,respec-tively,in the rifaximin group and80.4%versus19.6%, respectively,in the lactitol group.It should be pointed out that the percentage of patients with complete HE resolution was higher in the rifaximin group(53.1%)than in the lacti-tol group(37.2%).

Both treatments were well tolerated:in the group of patients treated with rifaximin,two patients reported mild diarrhea and one patient described abdominal pain,and in the lactitol group one patient reported mild diarrhea and another described vomiting,all probably related to the treat-ment.Severe diarrhea was not detected in the lactitol group, probably because the protocol allowed reduction of the dosage of the sachets.Other adverse events were considered not related to the treatment:bacterial infections in four cases,upper gastrointestinal bleeding in two,and one case each of mild impairment of renal function,herpes zoster, arterial hypertension and hyperkalemia.Six severe adverse events(three in each treatment group)were described:three patients died(one in the rifaximin group and two in the lactitol group)within28days of the last dose of the study medication;one patient died due to biliary sepsis and two patients died as a consequence of bleeding esophageal varices.None of these severe adverse events were consid-ered to be related to the study medication.

Systemic tolerability,monitored by laboratory tests,was good in both treatments.Statistical analysis showed no signi?cant differences between basal and?nal values.No statistically signi?cant differences were found between the treatment groups with respect to these variables at the end of treatment,except in potassium levels,with the percentage of patients with values outside the normal range being24.3% in the rifaximin group and7.5%in the lactitol group (P?0:419).

A.Mas et al./Journal of Hepatology38(2003)51–58

54

Table2

Baseline characteristics of HE episodes of patients at randomization a

Characteristics(stage)Rifaximin(n?50)Lactitol(n?53)Two-tailed P value b

HE

Stage000

Stage I13(26%)18(34%)

Stage II27(54%)23(43.4%)

Stage III10(20%)12(22.6%)

Stage IV00

Global 2.0(1–3) 2.0(1–3)0.6752(1)

Mental state 2.0(1–3) 2.0(0–3)0.8804(1)

Asterixis 3.0(0–4) 2.5(0–4)0.8413(1)

NCT

Stage 4.0(3–4) 4.0(2–4)0.0391(1)

Seconds120.0(95–400)120.0(52.5–1515.0)0.2276(1)

EEG

Stage 3.0(0–4) 2.0(0–4)0.1549(1)

Counts per second 4.34(1.74) 5.03(2.18)0.094(2)

Blood ammonia

Stage 1.0(0–4) 1.0(0–4)0.7963(1)

g/dl120.5(12.1–300)124.1(35–661.5)0.5868(1)

a Values of HE stage are expressed as number and percentage of patients and the other values are expressed as medians and ranges for non-parametric tests applied and as mean(SD)when parametric tests were applied(only for EEG,counts per second).A normal distribution test(Kolmogorov–Smirnov goodness of?t test)was applied to quantitative variables:NCT,seconds(two-tailed P?0:0000);EEG,counts per second(two-tailed P?0:1014);and blood ammonia, g/dl(two-tailed P?0:0363).Only EEG,counts per second was normally distributed and was analyzed by a parametric test.

b(1)Non-parametric test applied:Mann–Whitney U-test;(2)parametric test applied:Student’s t-test for equality of means.

4.Discussion

Non-absorbable disaccharides (lactulose,lactitol)are currently the most widely used pharmacological treatment in HE [4,5,7–9].These drugs pass unchanged through the small bowel and are metabolized by the intestinal bacteria of the colon leading to a reduction in fecal pH.This thereby produces a laxative effect,and diffusion of the ammonia to the lumen of the colon where it may be used for bacterial metabolism or eliminated by the feces.All of these effects causes a decrease in blood ammonia concentrations [9].

As stated before,oral poorly absorbable antibiotics are an alternative for pharmacological treatment of HE,with neomycin being the most frequent and widely used [9].Its mechanism of action is based on suppression of the intest-inal ?ora producing ammonia.Nephrotoxicity has been observed due to the intestinal absorption of this antibiotic and,although minimum,it may be of clinical importance if usage is prolonged.Therefore,neomycin has been replaced by non-absorbable disaccharides since both have shown a similar clinical ef ?cacy and the latter have shown fewer and less severe adverse effects [7,8].Other antibiotics used are paromomycin,metronidazole and vancomycin with similar results.

At present,the clinical value of pharmacologic treatment of acute HE remains controversial [4].Identi ?cation and treatment of the precipitating factor is the most important aspect in the management of acute HE [4,7,9].Nonetheless,despite this consideration,probably few cases of HE are managed with only the correction of the precipitating factor in clinical practice.

Rifaximin is a rifampicin derivative and is practically unabsorbable by the intestine.It has a wide antibacterial spectrum including gram-positive,gram-negative and anae-robic bacteria [11,12].Rifaximin has been used in different clinical situations such as gastroenteritis,diverticulitis,preparation of the colon for surgery [12],small bowel bacterial overgrowth [20]and more recently in managing intestinal gas production and gas-related syndromes [21].Given its pharmacologic characteristics (oral non-absorb-able antibiotic with wide antibacterial spectrum)this drug has also been used in the treatment of HE.Rifaximin has been compared with neomycin [15],paromomycin [14],and lactulose [17],showing similar results in both clinical improvement and reducing blood ammonia [17].In the

A.Mas et al./Journal of Hepatology 38(2003)51–58

56Fig.1.Time course of the HE grade and treatment effect in cirrhotic patients with grade I –III HE receiving treatment with rifaximin (1200mg/day)or lactitol (60g/day).Values are expressed as mean grade (SD).(*)Statistical difference between groups,P ?0.012;(**)differences between mean post-treatment grade and basal mean grade,P ?0.0000in both

groups.

Fig.2.Changes occurring in the PSE index in cirrhotic patients with grade I –III HE following 5–10days treatment with rifaximin (1200mg/day)or lactitol (60g/day).Values are expressed as mean grade (SD);n.s.?0.05level;(*)P values versus basal mean values,P ?0.0000in both groups;(**)signi ?cant comparison between groups,P ?0.0103in favor of the rifaximin group.

latter study rifaximin also showed greater tolerability and faster action.However,the results of these studies were inconclusive because some were open or uncontrolled [18],or included a small number of patients.A recent non-comparative study showed that rifaximin improved the PSE index,the absorption of the drug was extraordina-rily low(maximum urinary excretion equivalent to0.32%of the oral doses administered)and the most adequate dose was 1200mg daily[19].

The present study including a high number of patients shows that rifaximin is,from a clinical point of view,as effective as lactulose in the treatment of grade I–III HE, both treatments achieving an ef?cacy of greater than80%. In addition,rifaximin showed a signi?cantly greater ef?cacy in the reduction of plasma ammonia levels and improve-ment in EEG which were signi?cantly greater than those observed with lactulose,leading to a better evolution in the PSE index in patients receiving rifaximin.Although it has recently been suggested that the PSE index?rst described by Conn[8]is too‘arti?cial’[4,9],it continues to be used in the global evaluation of HE[19].

As stated before,the real ef?cacy of non-absorbable disaccharides or poor or non-absorbable antibiotics in HE remains doubtful,the correction of the precipitating cause being the main therapeutic approach.However,in this study an important proportion of the patients lacked a known precipitating cause,thereby emphasizing the need for phar-macologic treatment,at least in these cases.Since this situa-tion occurred in a greater,although non-signi?cant, proportion in the rifaximin group than in the lactitol group,this fact could theoretically account for the better ef?cacy of rifaximin.In summary,our results suggest that in acute HE of moderate to severe grade,rifaximin may be a good alternative to non-absorbable disaccharides.

5.Investigators and participating centers

A.Mas,

B.Arago′n,J.M.Salmero′n,J.Rode′s,Hospital Cl?′nic(Barcelona);L.Rodrigo,Hospital Central de Asturias (Oviedo);R.Planas,Hospital Germans Trias i Pujol(Bada-lona);V.Vargas,L.Castells,A.Gonza′lez,Hospital Vall d’Hebro′n(Barcelona);D.Rodr?′guez Mart?′nez,G.Ferna′n-dez Rodr?′guez,Hospital Xeral Cies(Vigo);I.Coll,J.M. Viver,Hospital Mu′tua de Terrassa(Terrassa);A.Pardo, Hospital Universitario de Canarias(Tenerife);M.Romero, G.Clemente,A.de Diego,Hospital General Universitario Gregorio Maran?o′n(Madrid);A.Castiella,I.Gil,J.I.Arenas Mirave,Hospital Ntra.Sra.de Ara′nzazu(San Sebastia′n);A. Garc?′a Erola,J.Berenguer,Hospital La Fe(Valencia);R. Mart?′n-Vivaldi,Hospital Virgen de las Nieves(Granada);

A.Garcia Plaza,L.Ruiz del A′rbol,Hospital Ramo′n y Cajal (Madrid);R.Moreno,J.M.Mateos,Hospital de la Princesa (Madrid);J.R.Vida′n,J.Elizalde,A.Mart?′nez,Hospital de Navarra(Pamplona).Acknowledgements

This research was supported by a grant given by Zambon S.A.(Spain).We are indebted to Alfa Wassermann Pharma-ceutical Company(Italy)for supplying the rifaximin tablets and lactitol sachets,active compounds and placebos. References

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