1. Division of Anaerobe Research, Life Science Research Center, Gifu University
2. Department of Obstetrics and Gynecology, Gifu University Hospital
3. Department of Obstetrics and Gynecology, Izumi Ladies Clinic
4. Department of Obstetrics and Gynecology, Gifu Municipal Hospital, Gifu City
5. Gifu College of Medical Technology, Seki City, Japan