Affiliation: | 1. Department of Obstetrics and Gynecology, Niigata University Graduate School of Medical and Dental Sciences, 1-757, Asahimachi-dori, Niigata, 951-8510, Japan;2. Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, 1-757, Asahimachi-dori, Niigata, 951-8510, Japan |