1. Department of Obstetrics and Gynecology Jikei University School of Medicine Tokyo Japan
2. Department of Obstetrics and Gynecology Showa University School of Medicine Tokyo Japan
3. Division of Clinical and Molecular Genetics, Department of Obstetrics and Gynecology Nagoya City University Nagoya Japan
4. Center of Maternal–Fetal, Neonatal and Reproductive Medicine National Center for Child Health and Development Tokyo Japan
5. Department of Human Genetics Yokohama City University Graduate School of Medicine Yokohama, Kanagawa Japan
6. Department of Obstetrics and Gynecology Hyogo College of Medicine Nishinomiya, Hyogo Japan
7. Department of Obstetrics Osaka City General Hospital Osaka City, Osaka Japan
8. Department of Obstetrics and Gynecology Hokkaido University Graduate School of Medicine Sapporo, Hokkaido Japan
9. Department of Obstetrics and Gynecology Nagasaki University Graduate School of Biomedical Sciences Nagasaki Japan
10. Maternal and Child Health Center Aiiku Hospital Tokyo Japan
11. Departments of Obstetrics and Gynecology Saitama Medical University School of Medicine Moroyama, Iruma, Saitama Japan
12. Department of Maternal and Fetal Medicine Tohoku University Graduate School of Medicine, Miyagi Children's Hospital Sendai, Miyagi Japan
13. Departments of Obstetrics and Gynecology Iwate Medical University School of Medicine Morioka, Iwate Japan
14. Department of Obstetrics and Gynecology Niigata University Medical and Dental Hospital Niigata Japan
15. Department of Obstetrics and Gynecology Kobe University Graduate School of Medicine Kobe, Hyogo Japan
16. Department of Obstetrics and Gynecology Ehime University School of Medicine Matsuyama, Ehime Japan
17. Department of Obstetrics and Gynecology Shikoku Medical Center for Children and Adults Zentsuji, Kagawa Japan
18. Department of Obstetrics and Gynecology University of Tokushima Faculty of Medicine Tokushima Japan
19. Department of Obstetrics and Gynecology, Clinical Research Institute National Hospital Organization Kyushu Medical Center Fukuoka Japan
20. Department of Obstetrics and Gynecology Chiba University Graduate School of Medicine Chiba Japan
21. Department of Obstetrics and Gynecology Fujita Health University Toyoake, Aichi Japan
22. Department of Obstetrics Osaka Medical Center and Research Institute for Maternal and Child Health Izumi, Osaka Japan
23. Department of Obstetrics and Gynecology Osaka University Faculty of Medicine Suita, Osaka Japan
24. Sanno Hospital Tokyo Japan
25. Perinatal Medical Center Tokyo Women's Medical University Hospital Tokyo Japan
26. Department of Obstetrics and Gynecology Tokai University School of Medicine Hiratsuka, Kanagawa Japan
27. Department of Obstetrics and Gynecology Toho University Omori Medical Center Tokyo Japan
28. Toho University Omori Medical Center Tokyo Japan
29. Department of Obstetrics and Gynecology Japanese Red Cross Medical Center Tokyo Japan
30. Department of Obstetrics and Gynecology Nara Medical University Kashihara, Nara Japan
31. Department of Perinatology and Gynecology National Cerebral and Cardiovascular Center Suita, Osaka Japan
32. Department of Obstetrics and Gynecology Okayama University Graduate School of Medicine Okayama Japan
33. Department of Obstetrics and Gynecology Hiroshima University Graduate School of Medicine Hiroshima Japan
34. Department of Molecular Pathology, Faculty of Medicine Oita University Oita Japan
35. Department of Obstetrics and Gynecology Kumamoto University Kumamoto Japan
36. Department of Obstetrics and Gynecology Showa University Northern Yokohama Hospital Yokohama, Kanagawa Japan
37. Division of Clinical Genetics Dokkyo Medical University Koshigaya Hospital Mibu, Shimotsuga, Tochigi Japan
38. Department of Pediatrics, Graduate school of medicine Gifu University Gifu Japan
39. Department of Obstetrics and Gynecology Chuden Hospital Hiroshima Japan
40. Departments of Obstetrics and Gynecology Tokyo University Hospital Tokyo Japan
41. Division of Clinical Genetics Nippon Medical School Hospital Tokyo Japan
42. Department of Clinical Genetics Nagoya City West Medical Center Nagoya Japan
43. Departments of Obstetrics and Gynecology Hyogo Prefectural Amagasaki General Medical Center Amagasaki, Hyogo Japan
44. Departments of Obstetrics and Gynecology Fukuoka University Hospital Fukuoka Japan
45. Departments of Genetic Counseling Ochanomizu University Tokyo Japan