[1] CHA Univ, CHA Bundang Med Ctr, Dept Internal Med, Div Nephrol, Seongnam, South Korea
[2] Yeungnam Univ, Med Ctr, Dept Internal Med, Med Ctr, 317-1 Daemyung Dong, Daegu 705717, South Korea
[3] Kyung Hee Univ, Med Ctr, Div Nephrol, Dept Internal Med,Sch Med, Seoul, South Korea
[4] Vet Hlth Serv Med Ctr, Dept Internal Med, Div Nephrol, Seoul, South Korea
[5] Korea Univ, Coll Med, Dept Internal Med, Div Nephrol, Seoul, South Korea
[6] Catholic Univ Korea, Yeouido St Marys Hosp, Coll Med, Dept Internal Med, Seoul, South Korea
[7] Presbyterian Med Ctr, Dept Internal Med, Div Nephrol, Jeonju, South Korea
[8] Ajou Univ, Sch Med, Dept Nephrol, Suwon, South Korea