[1] Catholic Univ Korea, Coll Med, Incheon St Marys Hosp, Div Gastroenterol,Dept Internal Med, 56 Dongsu Ro, Incheon 21431, South Korea
[2] Ewha Womans Univ, Dept Internal Med, Sch Med, Seoul, South Korea
[3] Kyungpook Natl Univ, Sch Med, Dept Internal Med, Daegu, South Korea
[4] Chonbuk Natl Univ, Dept Internal Med, Med Sch, Jeonju, South Korea
[5] Yonsei Univ, Severance Hosp, Dept Internal Med, Div Gastroenterol,Coll Med, Seoul, South Korea
[6] Chungnam Natl Univ, Dept Internal Med, Sch Med, Daejeon, South Korea
[7] Yeungnam Univ, Dept Internal Med, Sch Med, Daegu, South Korea
[8] Gyeongsang Natl Univ, Dept Internal Med, Sch Med, Jinju, South Korea
[9] Catholic Univ Korea, Yeouido St Marys Hosp, Dept Internal Med, Coll Med, Seoul, South Korea
[10] Gachon Univ, Dept Internal Med, Gil Med Ctr, Incheon, South Korea
[11] Korea Univ, Dept Internal Med, Div Gastroenterol, Guro Hosp, Seoul, South Korea
[12] Catholic Univ Korea, St Vincents Hosp, Dept Internal Med, Coll Med, Suwon, South Korea
[13] Konkuk Univ, Dept Internal Med, Sch Med, Seoul, South Korea
[14] Hallym Univ, Dept Internal Med, Coll Med, Chunchon, South Korea
[15] Catholic Univ Korea, St Paul Hosp, Dept Internal Med, Coll Med, Seoul, South Korea
[16] Konyang Univ Hosp, Dept Internal Med, Daejeon, South Korea
[17] Chonnam Natl Univ, Dept Internal Med, Med Sch, Gwangju, South Korea
[18] Dongguk Univ, Dept Internal Med, Coll Med, Gyeongju, South Korea
[19] Daegu Catholic Univ, Dept Internal Med, Div Gastroenterol, Coll Med, Daegu, South Korea
[20] Catholic Univ Korea, Seoul St Marys Hosp, Dept Internal Med, Coll Med, Seoul, South Korea
[21] Jeju Natl Univ, Dept Internal Med, Sch Med, Jeju, South Korea
[22] Eulji Univ, Dept Internal Med, Coll Med, Daejeon, South Korea
[23] Pusan Natl Univ, Dept Internal Med, Sch Med, Busan, South Korea
[24] Yonsei Univ, Dept Internal Med, Gangnam Severance Hosp, Coll Med, Seoul, South Korea
[25] Sahmyook Med Ctr, Dept Internal Med, Seoul, South Korea
[26] Sungkyunkwan Univ, Sch Med, Dept Med, Samsung Med Ctr, Seoul, South Korea
[27] Hallym Univ, Coll Med, Dongtan Sacred Heart Hosp, Dept Internal Med, Hwaseong, South Korea
[28] Natl Med Ctr, Dept Internal Med, Seoul, South Korea