1. Department of Obstetrics and Gynecology, Kobe University Graduate School of Medicine, Kobe, Japan; Department of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai, Japan; Nuffield Department of Obstetrics and Gynaecology, University of Oxford, Oxford, United Kingdom
2. Department of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai, Japan; Nuffield Department of Obstetrics and Gynaecology, University of Oxford, Oxford, United Kingdom; Department of Obstetrics and Gynecology, Kobe University Gradaute School of Medicine, 7-5-1 Kusunoki-Cho Chuo-ku, Kobe, Japan