Affiliation: | 1. Department of Obstetrics and Gynecology, Saitama City Hospital, , Saitama‐shi, Saitama, Japan;2. Department of Neonatology, Saitama City Hospital, , Saitama‐shi, Saitama, Japan;3. Department of Pediatric Imaging, Tokyo Metropolitan Children's Medical Center, , Fuchu‐shi, Tokyo, Japan |