1. Department of Obstetrics and Gynaecology Nagoya University Graduate School of Medicine Nagoya Japan
2. Department of Obstetrics and Gynaecology Japanese Red Cross Aichi Medical Center Nagoya Daini Hospital Nagoya Japan
3. Center for Maternal‐Neonatal Care Nagoya University Hospital Nagoya Japan
4. Diagnostic Radiology Japanese Red Cross Aichi Medical Center Nagoya Daini Hospital Nagoya Japan
5. Data Science Division, Data Coordinating Center, Department of Advanced Medicine Nagoya University Hospital Nagoya Japan