1. Department of Obstetrics and Gynecology Doai Kinen Hospital Tokyo Japan
2. Department of Obstetrics and Gynecology University of Tokyo Tokyo Japan
3. Department of Obstetrics and Gynecology Oita University Oita Japan
4. Department of Obstetrics and Gynecology Kumamoto University Kumamoto Japan
5. Department of Obstetrics and Gynecology Juntendo University Tokyo Japan
6. Department of Obstetrics and Gynecology Kyoto Prefectural University Kyoto Japan
7. Pneumothorax Research Center and Division of Thoracic Surgery Nissan Tamagawa Hospital Tokyo Japan
8. Department of Urology Juntendo University Tokyo Japan
9. Department of Surgical Oncology University of Tokyo Tokyo Japan
10. Department of Surgery International Catholic Hospital Tokyo Japan
11. Department of Obstetrics and Gynecology Tottori University Tottori Japan
12. Department of Thoracic Surgery University of Tokyo Tokyo Japan
13. Department of Plastic Surgery Jichi Medical University Shimotsuke Japan