1. The Recurrence Prevention Committee, The Japan Obstetric Compensation System for Cerebral Palsy Japan Council for Quality Health Care Tokyo Japan
2. Department of Obstetrics and Gynaecology Mie University Graduate School of Medicine Tsu Japan
3. Department of Obstetrics and Gynecology Sakakibara Heart Institute Tokyo Japan
4. Department of Paediatrics National Rehabilitation Center for Children with Disabilities Tokyo Japan
5. Department of Obstetrics and Gynaecology St. Marianna University School of Medicine Kawasaki Japan
6. Department of Public Health The University of Tokyo Tokyo Japan
7. Department of Obstetrics and Gynaecology Showa University Northern Yokohama Hospital Yokohama Japan
8. Department of Obstetrics and Gynaecology Hamamatsu University School of Medicine Shizuoka Japan
9. Maternal and Perinatal Care Centre Oita Prefectural Hospital Oita Japan
10. Department of Health Services Research, Faculty of Medicine University of Tsukuba Ibaraki Japan
11. Department of Obstetrics and Gynaecology Nippon Medical School Tokyo Japan
12. Department of Obstetrics and Gynaecology Fukushima Medical University Fukushima Japan
13. Maeda Clinic, Incorporated Association Anzu‐kai Shizuoka Japan
14. The Japan Obstetric Compensation System for Cerebral Palsy Japan Council for Quality Health Care Tokyo Japan
15. Kugayama Hospital Tokyo Japan
16. Department of Paediatrics Saitama Children's Medical Centre Saitama Japan