[1] Chungbuk Univ, Coll Med, Dept Hlth Informat & Management, Cheongju, Chungcheongbuk, South Korea
[2] Inha Univ, Div Rheumatol, Dept Internal Med, Incheon, South Korea
[3] Korea Univ, Dept Prevent Med, Coll Med, Seoul, South Korea
[4] Ewha Womans Univ, Med Res Inst, Coll Med, Seoul, South Korea
[5] Korea Univ, Grad Sch, Dept Publ Hlth, Seoul, South Korea
[6] Hlth Insurance Review & Assessment Serv, Dept Res, Wonju, South Korea