[1] Gilead Sci, Durham, NC USA
[2] Univ Paris, Hop Beaujon, Clichy, France
[3] Univ Vall Hebron & Ciberehd, Serv Med Interna Hepatol, Gen Hosp, Barcelona, Spain
[4] Univ Hosp St Ivan Rilsky, Sofia, Bulgaria
[5] Uludag Univ, Bursa, Turkey
[6] St Louis Univ, Sch Med, St Louis, MO USA
[7] Mt Sinai Sch Med, New York, NY USA
[8] Royal Free Hosp, London NW3 2QG, England
[9] Univ Toronto, Toronto, ON, Canada