[1] Catholic Univ Korea, Eunpyeong St Marys Hosp, Coll Med, Dept Internal Med,Div Nephrol, Seoul, South Korea
[2] Catholic Univ Korea, Uijeongbu St Marys Hosp, Coll Med, Dept Internal Med,Div Nephrol, Seoul, South Korea
[3] Keimyung Univ, Sch Med, Dept Internal Med, Div Nephrol, Daegu, South Korea
[4] Hanyang Univ, Coll Med, Dept Internal Med, Div Nephrol, Seoul, South Korea
[5] Hallym Univ, Dept Internal Med, Div Nephrol, Kangnam Sacred Heart Hosp, Seoul, South Korea
[6] Seoul Natl Univ, Coll Med, Dept Internal Med, Div Nephrol, Seoul, South Korea
[7] Kyung Hee Univ, Kyunghee Univ Hosp Gangdong, Coll Med, Dept Internal Med,Div Nephrol, Seoul, South Korea
[8] Gachon Univ, Coll Med, Dept Internal Med, Div Nephrol,Gil Med Ctr, Incheon, South Korea
[9] Yonsei Univ, Gangnam Severance Hosp, Dept Internal Med, Div Nephrol,Coll Med, Seoul, South Korea
[10] Korea Univ, Coll Med, Dept Internal Med, Div Nephrol,Guro Hosp, Seoul, South Korea
[11] Catholic Univ Korea, Daejeon St Marys Hosp, Dept Internal Med, Div Nephrol,Coll Med, Seoul, South Korea