1. Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
2. Department of Gynecology, Cancer Institute Hospital, Tokyo, Japan
3. Department of Obstetrics and Gynecology, The Jikei University School of Medicine, Chiba, Japan
4. Translational Research Informatics Center, Foundation for Biomedical Research and Innovation, Kobe, Japan
5. Department of Biostatistics, Kyoto Prefectural University of Medicine, Graduate School of Medical Science, Kyoto, Japan