[1] Massachusetts Gen Hosp, Boston, MA 02114 USA
[2] Orebro Univ Hosp, Orebro, Sweden
[3] Karolinska Univ Hosp, Dept Infect Dis, Solna, Sweden
[4] Karolinska Inst, Div Hepatol, Ctr Digest Dis, Solna, Sweden
[5] Massachusetts Gen Hosp, Ctr Liver, Boston, MA 02114 USA
[6] Massachusetts Gen Hosp, Gastrointestinal Div, Boston, MA 02114 USA
[7] Harvard Med Sch, Boston, MA USA
[8] Karolinska Inst, Med Epidemiol & Biostat, Solna, Sweden