[1] Sahmyook Univ, Chung Ang Univ Hosp, Seoul, South Korea
[2] Seoul Natl Univ, Coll Med, Dept Internal Med, Bundang Hosp, Seoul, South Korea
[3] Hanyang Univ, Seoul, South Korea
[4] Hlth Insurance Review & Assessment Serv, Wonju, South Korea
[5] Chung Ang Univ, Coll Med, Seoul, South Korea