[1] Chuncheon Sacred Heart Hosp, Dept Internal Med GI Hepatol, Chunchon, South Korea
[2] Korea Univ, Dept Internal Med GI Hepatol, Guro Hosp, Seoul, South Korea
[3] Catholic Univ Korea, Dept Internal Med GI Hepatol, Incheon St Marys Hosp, Seoul, South Korea
[4] Asan Med Ctr, Dept Internal Med GI Hepatol, Seoul, South Korea
[5] Hanyang Univ, Dept Internal Med GI Hepatol, Guri Hosp, Seoul, South Korea
[6] Kangbuk Samsung Med Ctr, Dept Internal Med GI Hepatol, Seoul, South Korea
[7] Catholic Univ Korea, Dept Internal Med GI Hepatol, St Marys Hosp, Seoul, South Korea
[8] Chung Ang Univ Hosp, Dept Internal Med GI Hepatol, Seoul, South Korea
[9] Ewha Womans Univ, Dept Internal Med GI Hepatol, Mokdong Hosp, Seoul, South Korea
[10] Pusan Natl Univ Hosp, Dept Internal Med GI Hepatol, Pusan, South Korea