[1] Sungkyunkwan Univ, Samsung Kangbuk Hosp, Ctr Cohort Studies, Total Healthcare Ctr,Sch Med, Seoul, South Korea
[2] Kyung Hee Univ, Sch Med, Dept Prevent Med, Seoul, South Korea
[3] Kyung Hee Univ, Sch Med, Dept Occupat, Seoul, South Korea
[4] Kyung Hee Univ, Sch Med, Dept Environm Med, Seoul, South Korea
[5] Sungkyunkwan Univ, Samsung Kangbuk Hosp, Sch Med, Dept Orthopaed Surg, Seoul, South Korea
[6] Sungkyunkwan Univ, Samsung Kangbuk Hosp, Sch Med, Total Healthcare Ctr, Seoul, South Korea