1. Department of Obstetrics and Gynecology Hokkaido University Graduate School of Medicine Sapporo Japan
2. Department of Obstetrics and Gynecology KKR Sapporo Medical Center Sapporo Japan
3. Department of Diagnostic and Interventional Radiology Hokkaido University Hospital Sapporo Japan
4. Department of Surgical Pathology Hokkaido University Hospital Sapporo Japan
5. Department of Pathology Kushiro Rosai Hospital Kushiro Japan
6. Women's Healthcare Center (Gynecology) Otaru General Hospital Otaru Japan