Affiliation: | 1. Department of Anatomy, Nihon University School of Medicine, Tokyo, Japan;2. Department of Urology, Kobe University Graduate School of Medicine, Kobe, Japan;3. Faculty of Medicine, Institute of Embryology, Universidad Complutense Madrid, Madrid, Spain;4. Division of Internal Medicine, Iwamizawa Kojin‐kai Hospital, Iwamizawa, Japan |