1. Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Korea.
2. Cancer Registration and Statistics Branch, National Cancer Center, Goyang, Korea.
3. Molecular Epidemiology Branch, National Cancer Center, Goyang, Korea.
4. Department of Obstetrics and Gynecology, University of Hong Kong, Hong Kong.
5. Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan.
6. Department of Obstetrics and Gynecology, National University Hospital, Singapore.