[1] Mayo Clin, Gastroenterol Res Unit, Adv Liver Dis Study Grp, Fiterman Ctr Digest Dis, Rochester, MN 55905 USA
[2] Univ Paris 06, Grp Hosp Pitie Salpetriere, AP HP, Serv Hepatogastroenterol, Paris, France
[3] Shandong Univ, Dept Gastroenterol, Prov Hosp, Jinan, Shandong, Peoples R China