1. Hokkaido University Graduate School of Medicine; Sapporo
2. Maeda Women's Clinic; Shizuoka
3. Graduate School of Medicine; University of Tokyo
4. Faculty of Medicine; University of Tsukuba; Tsukuba
5. Chiba Kaihin Municipal Hospital
6. Juntendo University School of Medicine
7. Hamamatsu University School of Medicine
8. Kyorin University School of Medicine; Mitaka
9. Osaka University Graduate School of Medicine; Osaka
10. Shinsyu University School of Medicine; Matsumoto
11. Ashikaga Red Cross Hospital; Ashikaga
12. Douai Memorial Hospital
13. Asahi Central Hospital; Chiba
14. Nagoya University Graduate School of Medicine
15. Hiroshima University Graduate School of Medicine; Hiroshima
16. Tokyo Women's Medical University Yachiyo Medical Center
17. Jichi Medical University School of Medicine; Shimotsuke
18. Matsuda Perinatal Clinic; Tokorozawa
19. Nagasaki University Graduate School of Medicine; Nagasaki
20. Seirei Hamamatsu General Hospital; Hamamatsu
21. Miyagi Children's Hospital; Sendai
22. Ohno Ladies Clinic; Iwakura
23. Sanno Hospital
24. Oita Prefectural Hospital; Oita
25. Showa University School of Medicine
26. Nagoya City University School of Medicine; Nagoya
27. Katsushika Red Cross Hospital; Tateishi
28. Yokohama City University Medical Center; Yokohama
29. National Center for Child Health and Development; Tokyo
30. Kitasato University School of Medicine; Sagamihara Japan