[1] DIV GASTROENTEROL,MOLINETTE,CS BRAMANTE 88,I-10126 TORINO,ITALY
[2] OSPED L SACCO,DIV INFECT DIS,MILAN,ITALY
[3] UNIV NAPLES,I-80134 NAPLES,ITALY
[4] UNIV BARI,INFECT DIS CLIN,I-70124 BARI,ITALY
[5] HOP EDOUARD HERRIOT,F-69003 LYON,FRANCE
[6] HOP ST ANTOINE,F-75571 PARIS 12,FRANCE
[7] UNIV LONDON KINGS COLL HOSP,LIVER UNIT,LONDON SE5 8RX,ENGLAND