[1] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Seoul, South Korea
[2] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Ctr Hlth Promot, Seoul, South Korea
[3] Inje Univ, Ilsan Paik Hosp, Coll Med, Goyang, South Korea
[4] Eulji Univ, Eulji Gen Hosp, Sch Med, Seoul, South Korea