[1] Ewha Womans Univ, Dept Internal Med, Coll Med, Seoul, South Korea
[2] Keimyung Univ, Dept Internal Med, Sch Med, Daegu, South Korea
[3] Korea Univ, Guro Hosp, Dept Internal Med, Div Gastroenterol,Coll Med, Seoul, South Korea
[4] Hanyang Univ, Guri Hosp, Dept Internal Med, Coll Med, Guri, South Korea
[5] Hallym Univ, Dept Internal Med, Coll Med, Chunchon, South Korea
[6] Seoul Natl Univ, Bundang Hosp, Dept Internal Med, Seongnam, South Korea
[7] Hallym Univ, Sacred Heart Hosp, Coll Med, Dept Internal Med, Anyang, South Korea
[8] Korea Univ, Anam Hosp, Dept Internal Med, Div Gastroenterol & Hepatol,Coll Med, Seoul, South Korea
[9] Natl Evidence Based Healthcare Collaborating Agcy, Seoul, South Korea
[10] Dongguk Univ, Ilsan Hosp, Dept Gastroenterol, Goyang, South Korea
[11] Korean Coll Helicobacter & Upper Gastrointestinal, Obes & Nutr Res Grp, Seoul, South Korea
[12] Catholic Univ Korea, Eunpyeong St Marys Hosp, Coll Med, Dept Internal Med,Div Gastroenterol, Seoul, South Korea
[13] Korean Soc Gastrointestinal Endoscopy, Res Grp Endoscopes & Devices, Seoul, South Korea
[14] Univ Ulsan, Asan Med Ctr, Dept Gastroenterol, Coll Med, Seoul, South Korea
[15] Pusan Natl Univ, Pusan Natl Univ Hosp, Dept Internal Med, Coll Med, Busan, South Korea
[16] Pusan Natl Univ, Biomed Res Inst, Busan, South Korea
[17] Soonchunhyang Univ, Bucheon Hosp, Dept Internal Med, Div Gastroenterol, Bucheon, South Korea
[18] Hanyang Univ, Dept Internal Med, Sch Med, Seoul, South Korea