1. Department of Pediatrics, Center for Pediatric Cancer, National Cancer Center, Goyang 10408, Republic of Korea
2. Biostatistics Collaboration Team, Research Core Center, National Cancer Center, Goyang 10408, Republic of Korea
3. Department of Pathology, Center for Gynecologic Cancer, National Cancer Center, Goyang 10408, Republic of Korea
4. Gynecologic Cancer Branch, Center for Gynecologic Cancer, National Cancer Center, Goyang 10408, Republic of Korea
5. Department of Pediatrics, Seoul Metropolitan Seonam Hospital, Seoul 08049, Republic of Korea