[1] Chonnam Natl Univ, Dept Internal Med, Med Sch, 160 Baekseo Ro, Gwangju 61469, South Korea
[2] Wonkwang Univ, Dept Internal Med, Coll Med, Iksan, South Korea
[3] Univ Ulsan, Dept Internal Med, Coll Med, Seoul, South Korea
[4] Seoul Natl Univ, SNU Boramae Med Ctr, Dept Internal Med, SMG,Coll Med, Seoul, South Korea
[5] Chungnam Natl Univ, Dept Internal Med, Coll Med, Daejeon, South Korea
[6] Soon ChunHyang Univ, Dept Internal Med, Sch Med, Bucheon, South Korea
[7] Inje Univ, Ilsan Paik Hosp, Dept Internal Med, Coll Med, Goyang, South Korea
[8] Inje Univ, Sanggye Paik Hosp, Dept Internal Med, Coll Med, Seoul, South Korea
[9] Keimyung Univ, Dongsan Med Ctr, Dept Internal Med, Sch Med, Daegu, South Korea
[10] Kyungpook Natl Univ, Chilgok Hosp, Sch Med, Dept Internal Med, Daegu, South Korea
[11] Inha Univ, Dept Internal Med, Sch Med, Incheon, South Korea
[12] Catholic Univ Korea, Eunpyeong St Marys Hosp, Coll Med, Dept Internal Med, Seoul, South Korea
[13] Eulji Univ, Uijeongbu Eulji Med Ctr, Dept Internal Med, Sch Med, Uijongbu, South Korea
[14] Hallym Univ, Coll Med, Dept Internal Med, Div Gastroenterol,Dongtan Sacred Heart Hosp, Hwaseong, South Korea
[15] Natl Evidence Based Healthcare Collaborating Agcy, Seoul, South Korea