1. Department of Obstetrics and Gynecology; Graduate School of Medicine; The University of Tokyo; Bunkyo-ku, Tokyo Japan
2. Department of Obstetrics, Gynecology and Women's Health; University of Missouri; Columbia Missouri
3. Tsumura Kampo Research Laboratories; Kampo Research and Development Division; Tsumura & Co.; Minato-ku, Tokyo Japan
4. Department of Obstetrics and Gynecology; Faculty of Medicine; Nihon University; Tokyo Japan