1. Department of Internal Medicine; Kamiamakusa-Shiritsu Kamiamakusa Sogo Byoin; Kamiamakusa-shi Japan
2. Department of Obstetrics and Gynecology; Jichi Medical University School of Medicine; Shimotsuke-shi Japan
3. Department of Gastroenterology; Saitama Medical Center, Jichi Medical University; Omiya Japan
4. Department of Obstetrics and Gynecology; Kamiamakusa-Shiritsu Kamiamakusa Sogo Byoin; Kamiamakusa-shi Japan