1. Department of Cardiovascular Surgery Jichi Medical University Shimotsuke Tochigi Japan
2. Department of Vascular Surgery Koga Red Cross Hospital Koga Ibaraki Japan
3. Department of Pediatrics Jichi Medical University Shimotsuke Tochigi Japan
4. Department of Obstetrics and Gynecology Jichi Medical University Shimotsuke Tochigi Japan
5. Department of Obstetrics and Gynecology Koga Red Cross Hospital Koga Ibaraki Japan