[1] Yonsei Univ, Yongin Severance Hosp, Coll Med, Dept Internal Med, Seoul, South Korea
[2] Keimyung Univ, Dept Stat, Daegu, South Korea
[3] Yonsei Univ, Coll Med, Gangnam Severance Hosp, Dept Internal Med, Seoul, South Korea
[4] Yonsei Univ, Severance Hosp, Coll Med, Dept Internal Med, Seoul, South Korea
[5] Hallym Univ, Coll Med, Dept Internal Med, Chunchon, Gangwon Do, South Korea
[6] Konyang Univ, Coll Med, Dept Internal Med, Div Gastroenterol, Daejeon, South Korea
[7] Korea Univ, Coll Med, Dept Internal Med, Seoul, South Korea
[8] Kosin Univ, Coll Med, Dept Internal Med, Pusan, South Korea
[9] Keimyung Univ, Sch Med, Dept Internal Med, Daegu, South Korea
[10] Daegu Catholic Univ, Sch Med, Dept Internal Med, Daegu 42472, South Korea
[11] Dongguk Univ, Coll Med, Dept Internal Med, Goyang, Gyeonggi Do, South Korea
[12] Seoul Natl Univ, Bundang Hosp, Dept Internal Med, Seongnam, Gyeonggi Do, South Korea
[13] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Gastroenterol, Seoul, South Korea
[14] Soonchunhyang Univ, Dept Internal Med, Bucheon, Gyeonggi Do, South Korea
[15] Gangnam Severance Hosp, Hlth Promot, Seoul, South Korea
[16] Wonkwang Univ, Sch Med, Dept Gastroenterol, Iksan, Jeonrabug Do, South Korea
[17] Ewha Womans Univ, Coll Med, Dept Internal Med, Seoul, South Korea
[18] Gyeongsang Natl Univ, Gyeongsang Natl Univ Hosp, Coll Med, Dept Internal Med, Jinju, South Korea
[19] Ajou Univ, Sch Med, Dept Gastroenterol, Suwon, Gyeonggi Do, South Korea
[20] Yonsei Univ, Gangnam Severance Hosp, Coll Med, Dept Internal Med, 211 Eonjuro, Gangnam-gu, Seoul 06273, South Korea
[21] Ajou Univ, Sch Med, Dept Gastroenterol, 164 World Cup, Suwon 16499, Gyeonggi Do, South Korea