1. Department of Reproductive Medicine Kameda IVF Clinic Makuhari Chiba Japan
2. Department of Gynecology and Obstetrics Sanmu Medical Center Chiba Japan
3. Department of Urology Kameda Medical Center Chiba Japan
4. Department of Urology Chiba University Graduate School of Medicine Chiba Japan
5. Fukushima Medical Center for Children and Women Fukushima Medical University Fukushima Japan
6. Department of Diagnostic Pathology Kameda Medical Center Chiba Japan