1. Center for Development of Advanced Medical Technology, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke 329-0431, Japan
2. Center for Advanced Research and Education, Asahikawa Medical University, 2-1-1-1 Midorigaoka-Higashi, Asahikawa, Hokkaido 078-8510, Japan
3. Advanced Interdisciplinary Biomedical Engineering, Tohoku University Graduate School of Medicine, 2-1 Seiryou-cho, Aoba-ku, Sendai 980-8575, Japan
4. Center for Maternal-Fetal, Neonatal and Reproductive Medicine, National Center for Child Health and Development, 2-10-1 Okura, Setagaya-ku, Tokyo 157-8535, Japan
5. Katta General Hospital, 36 Simoharaoki, Fukuokakuramoto, Shiroishi 989-0231, Japan
6. Atom Medical Corporation, 3-18-15 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
7. Department of Gynecology and Obstetrics, Tohoku University Graduate School of Medicine, 2-1 Seiryou-cho, Aoba-ku, Sendai 980-8575, Japan
8. South Miyagi Medical Center, 38-1 Nishi, Ōgawara 989-1253, Japan