1. Department of Obstetrics and Gynecology Juntendo University, Graduate School of Medicine Tokyo Japan
2. Oita Prefectural Hospital Oita Japan
3. Yokohama City University Medical Center Yokohama Japan
4. Fukushima Clinic Fukushima Japan
5. St. Marianna University School of Medicine Kawasaki Japan
6. Tokyo Metropolitan Bokutoh Hospital Tokyo Japan
7. Saitama Medical University Hospital Saitama Japan
8. Kumamoto University Graduate School of Medicine Kumamoto Japan
9. Juntendo University Urayasu Hospital Urayasu Japan
10. Showa University School of Medicine Tokyo Japan
11. Kansai Medical University Osaka Japan
12. Graduate School of Medicine University of Tokyo Tokyo Japan
13. Toho University Omori Medical Center Tokyo Japan
14. Dokkyo Medical University Mibu Japan
15. Fukushima Medical University Fukushima Japan
16. Shizuoka Children's Hospital Shizuoka Japan
17. Faculty of Medicine University of Tsukuba Tsukuba Japan
18. Ohno Women's Clinic Iwakura Japan
19. Minami Nagareyama Ladies Clinic Nagareyama Japan
20. Kawasaki Medical School Okayama Japan
21. University of Toyama Toyama Japan
22. Nihon Medical University Tokyo Japan
23. Hirosaki University Hospital Hirosaki Japan
24. Nagano Children's Hospital Azumino Japan
25. Hiroshima University, Graduate School of Medicine Hiroshima Japan
26. Maeda Women's Clinic Shizuoka Japan
27. Graduate School of Medicine Chiba University Chiba Japan