[1] Catholic Univ Korea, Eunpyeong St Marys Hosp, Dept Internal Med, Coll Med, Seoul, South Korea
[2] Catholic Univ Korea, Dept Prevent Med & Publ Hlth, Coll Med, Seoul, South Korea
[3] Catholic Univ Korea, Eunpyeong St Marys Hosp, Dept Surg, Coll Med, Seoul, South Korea
[4] Catholic Univ Korea, St Vincents Hosp, Dept Internal Med, Coll Med, Seoul, South Korea