[1] Chung Ang Univ, Dept Internal Med, Coll Med, Seoul, South Korea
[2] Dongguk Univ, Coll Med, Gyeongju Hosp, Dept Internal Med, Gyeongju, South Korea
[3] Jeju Natl Univ, Sch Med, Dept Internal Med, Jeju, South Korea
[4] Kyungpook Natl Univ, Sch Med, Dept Internal Med, Daegu, South Korea
[5] Pusan Natl Univ, Sch Med, Dept Internal Med, Busan, South Korea
[6] Chonnam Natl Univ, Med Sch, Dept Internal Med, Gwangju, South Korea
[7] Catholic Univ Korea, Bucheon St Marys Hosp, Dept Gastroenterol, Coll Med, Bucheon, South Korea
[8] Ewha Womans Univ, Sch Med, Dept Internal Med, Seoul, South Korea
[9] Soon Chun Hyang Univ, Cheonan Hosp, Dept Internal Med, Coll Med, Cheonan, South Korea
[10] Kosin Univ, Coll Med, Dept Internal Med, Gospel Hosp, Busan, South Korea
[11] Natl Canc Ctr, Ctr Gastr Canc, Gyeonggi, South Korea
[12] Inje Univ, Pusan Paik Hosp, Dept Internal Med, Coll Med, Busan, South Korea
[13] Catholic Univ Korea, Coll Med, Dept Internal Med, Incheon, South Korea
[14] Hallym Univ, Dept Internal Med, Coll Med, Seoul, South Korea
[15] Daegu Fatima Hosp, Dept Internal Med, Daegu, South Korea
[16] Gyeongsang Natl Univ, Dept Internal Med, Sch Med, Jinju, South Korea
[17] Catholic Univ Korea, Coll Med, Dept Internal Med, St Pauls Hosp, Seoul, South Korea
[18] Seoul Natl Univ, Coll Med, Dept Internal Med, Seoul, South Korea
[19] Seoul Natl Univ, Coll Med, Liver Res Inst, Seoul, South Korea
[20] Sungkyunkwan Univ, Samsung Med Ctr, Sch Med, Dept Med, Seoul, South Korea
[21] Seoul Natl Univ, Dept Prevent Med, Coll Med, Seoul, South Korea
[22] Seoul Natl Univ, Dept Biomed Sci, Grad Sch, Seoul, South Korea
[23] Seoul Natl Univ, Res Inst, Seoul, South Korea
[24] Inha Univ, Sch Med, Inha Univ Hosp, Dept Prevent & Management, Incheon, South Korea