Affiliation: | 1. Department of Obstetrics and Gynecology, Mie University Faculty Medicine, Mie, Japan;2. Department of Obstetrics and Gynecology, Sakakibara Heart Institute, Tokyo, Japan;3. Department of Obstetrics and Gynecology, St. Marianna University School of Medicine, Kawasaki, Japan;4. Department of Obstetrics and Gynecology, Toho University Omori Medical Center, Tokyo, Japan;5. Division of Perinatology, Maternal and Perinatal Care Center, Seirei Hamamatsu General Hospital, Hamamatsu, Japan;6. Department of Obstetrics and Gynecology, Showa University School of Medicine, Tokyo, Japan;7. Department of Obstetrics and Gynecology, Hamamatsu University School of Medicine, Hamamatsu, Japan;8. Ishiwata Obstetrics and Gynecology Hospital, Ibaraki, Japan |