[1] HOSP GEN VALLE HEBRON,DEPT INTERNAL MED,LIVER UNIT,E-08035 BARCELONA,SPAIN
[2] HOSP GEN VALLE HEBRON,CLIN PHARMACOL UNIT,E-08035 BARCELONA,SPAIN
[3] INST CATALA SALUT,BLOOD BANK,BARCELONA,SPAIN
[4] UNIV AUTONOMA BARCELONA,HOSP SANTA CRUZ & SAN PABLO,BLOOD BANK,BARCELONA,SPAIN
[5] UNIV AUTONOMA BARCELONA,HOSP SANTA CRUZ & SAN PABLO,GASTROENTEROL UNIT,BARCELONA,SPAIN
[6] NIH,WARREN GRANT MAGNUSON CLIN CTR,DEPT TRANSFUS MED,BETHESDA,MD