[1] Inha Univ, Inha Univ Hosp, Dept Internal Med, Sch Med, 27 Inhang Ro, Incheon 22332, South Korea
[2] Korea Univ Ansan Hosp, Dept Internal Med, Div Gastroenterol & Hepatol, Ansan, South Korea
[3] Catholic Univ Korea, St Vincents Hosp, Dept Internal Med, Coll Med, Seoul, South Korea
[4] Soonchunhyang Univ Hosp Bucheon, Dept Internal Med, Bucheon, South Korea
[5] Hallym Univ, Inst Liver & Digest Dis, Chunchon, South Korea
[6] Hallym Univ, Coll Med, Dept Internal Med, Chunchon, South Korea
[7] Inje Univ, Sanggye Paik Hosp, Dept Internal Med, Div Gastroenterol & Hepatol,Coll Med, Seoul, South Korea
[8] Gyeongsang Natl Univ, Changwon Hosp, Dept Internal Med, Sch Med, Chang Won, South Korea
[9] Catholic Univ Korea, Uijeongbu St Marys Hosp, Dept Internal Med, Coll Med, Seoul, South Korea
[10] Soonchunhyang Univ, Soonchunhyang Univ Hosp, Coll Med, Inst Digest Res, Seoul, South Korea
[11] Soonchunhyang Univ, Soonchunhyang Univ Hosp, Coll Med, Digest Dis Ctr,Dept Internal Med, Seoul, South Korea