[1] Inje Univ, Sanggye Paik Hosp, Dept Internal Med, Coll Med, Seoul 01757, South Korea
[2] Hanyang Univ, Hanyang Univ Hosp, Dept Internal Med, Coll Med, Seoul 04763, South Korea
[3] Hanyang Univ, Guri Hosp, Dept Internal Med, Coll Med, Guri Si 11923, South Korea
[4] New Hope Internal Med Clin, Dept Internal Med, Seoul 03113, South Korea
[5] Catholic Univ Korea, Coll Med, Dept Internal Med, St Vincents Hosp, Suwon 16247, South Korea
[6] Eulji Univ, Coll Med, Dept Internal Med, Nowon Eulji Med Ctr, Seoul 01830, South Korea
[7] Catholic Univ Korea, Coll Med, Dept Internal Med, Uijeongbu St Marys Hosp, Uijeongbu Si 11765, South Korea
[8] Korea Univ, Med Ctr, Dept Internal Med, Ansan 02841, South Korea
[9] Catholic Univ Korea, Coll Med, Dept Internal Med, Daejeon St Marys Hosp, Daejeon 34943, South Korea
[10] Hallym Univ, Coll Med, Dept Internal Med, Sacred Heart Hosp, Anyang Si 14068, South Korea
[11] Hallym Univ, Coll Med, Dept Internal Med, Kangdong Sacred Heart Hosp, Seoul 05355, South Korea
[12] Soonchunhyang Univ, Coll Med, Dept Internal Med, Seoul Hosp, Seoul 04401, South Korea
[13] Soonchunhyang Univ, Coll Med, Dept Internal Med, Bucheon Hosp, Bucheon Si 14584, South Korea
[14] Konyang Univ, Coll Med, Dept Internal Med, Daejeon 35365, South Korea
[15] Sungkyunkwan Univ, Sch Med, Dept Internal Med, Kangbuk Samsung Hosp, Seoul 03181, South Korea
[16] Hanyang Univ, Dept Arts & Technol, Seoul 04763, South Korea