[1] Seoul Natl Univ, Sch Publ Hlth, Dept Epidemiol & Biostat, Seoul, South Korea
[2] Ewha Womans Univ, Coll Med, Dept Prevent Med, Ewha Med Res Ctr,Sch Med, Seoul 158056, South Korea
[3] Korea Ctr Dis Control & Prevent, Ewha Global Gchallenge Project Med, Div Cron Dis Surveillance, Seoul, South Korea
[4] Ewha Womans Univ, Sch Med, Dept Obstet & Gynecol, Seoul, South Korea
[5] Hanyang Univ, Dept Publ Hlth & Management, Seoul, South Korea
[6] Hanyang Univ, Inst Environm & Ind Med, Seoul, South Korea