[1] SUNY Downstate Med Ctr, Div Hepatol, Brooklyn, NY 11203 USA
[2] Univ Alberta, Edmonton, AB T6G 2M7, Canada
[3] Univ Padua, Padua, Italy
[4] Univ Toronto, Toronto, ON, Canada
[5] Univ Calgary, Calgary, AB T2N 1N4, Canada
[6] Newcastle Univ, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[7] Mayo Clin, Rochester, MN USA
[8] Columbia Univ, New York, NY USA