1. Department of Gastroenterology and Hepatology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
2. Department of Obstetrics and Gynecology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
3. Department of Obstetrics and Gynecology, Oji General Hospital, Tomakomai, Japan.
4. Division of Gynecologic Oncology, National Hospital Organization, Hokkaido Cancer Center, Sapporo, Japan.
5. Department of Obstetrics and Gynecology, Iwate Medical University School of Medicine, Morioka, Japan.
6. Department of Clinical Trial Data Management, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.
7. Department of Biostatistics, Japanese Organisation for Research and Treatment of Cancer, Tokyo, Japan.
8. Cancer Preventive Institute, Health Sciences University of Hokkaido, Tobetsu, Japan.
9. Division of Biostatistics, Tohoku University Graduate School of Medicine, Sendai, Japan.
10. Division of Cancer Pathophysiology, Group for Translational Research, National Cancer Center Research Institute, Tokyo, Japan.
11. Department of Palliative Medicine, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan.