[1] Beth Israel Deaconess Med Ctr, Div Gastroenterol, Ctr Liver, Boston, MA 02215 USA
[2] Univ Genoa, Dept Internal Med, Gastroenterol Unit, I-16126 Genoa, Italy
[3] Post Grad Med Inst, Dept Med Gastroenterol & Hepatol, Lahore, Pakistan
[4] Lahore Gen Hosp, Lahore, Pakistan
[5] Serv Hosp Lahore, Serv Inst Med Sci, Dept Gastroenterol, Lahore, Pakistan
[6] Inha Univ Hosp & Sch Med, Dept Internal Med, Inchon, South Korea
[7] Casa Sollievo Sofferenza Hosp, Div Gastroenterol, Dept Internal Med, San Giovanni Rotondo, Italy
[8] Univ Miami, Miller Sch Med, Ctr Liver Dis, Miami, FL 33136 USA
[9] Duke Univ, Med Ctr, Div Gastroenterol, Durham, NC 27710 USA
[10] GlaxoSmithKline Inc, Clin Dev, Uxbridge, Middx, England
[11] GlaxoSmithKline Inc, Biometr & Epidemiol, Collegeville, PA USA
[12] GlaxoSmithKline Inc, Clin Dev, Collegeville, PA USA
[13] GlaxoSmithKline Inc, Clin Dev, Res Triangle Pk, NC USA