1. Department of Obstetrics and Gynecology; Kurume University School of Medicine; Kurume Japan
2. Department of Physiology; Kurume University School of Medicine; Kurume Japan
3. Institute of Animal Experimentation; Kurume University School of Medicine; Kurume Japan
4. Radioisotope Institute for Basic and Clinical Medicine; Kurume University School of Medicine; Kurume Japan
5. Department of Obstetrics and Gynecology; Yanagawa Hospital; Yanagawa Japan