[1] Natl Canc Ctr, Seoul, South Korea
[2] Ajou Univ Hosp, Suwon, South Korea
[3] Chungnam Natl Univ Hosp, Chungnam, South Korea
[4] Natl Canc Ctr, Res Inst & Hosp, Div Canc Epidemiol & Prevent, Biometr Res Branch, Goyang, South Korea
[5] Univ Calif Irvine, Med Ctr, Orange, CA USA
[6] Natl Canc Ctr, Res Inst & Hosp, Ctr Uterine Canc, Goyang, South Korea