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 Gynecology Mie University Graduate School of Medicine Tsu Mie Japan
3. Department of Obstetrics and Gynecology Sakakibara Heart Institute Tokyo Japan
4. Department of Obstetrics and Gynecology Geffen School of Medicine at UCLA Los Angeles California USA
5. Faculty of Nursing Wayo Women's University Chiba Japan
6. Department of Obstetrics and Gynecology Showa University Northern Yokohama Hospital Yokohama Kanagawa Japan
7. Department of Obstetrics and Gynecology Hamamatsu University School of Medicine Shizuoka Japan
8. Maternal and Perinatal Care Center Oita Prefectural Hospital Oita Japan
9. Department of Health Services Research, Faculty of Medicine University of Tsukuba Ibaraki Japan
10. Department of Obstetrics and Gynecology Nippon Medical School Tokyo Japan
11. Department of Obstetrics and Gynecology Fukushima Medical University Fukushima Japan
12. Maeda Clinic Incorporated Association Anzu‐kai Shizuoka Japan
13. Department of Pediatrics Saitama Children's Medical Center Saitama Japan
14. Kugayama Hospital Tokyo Japan