1. Division of Urology, Department of Surgery, School of Medicine, Faculty of Medicine, Tottori University, Yonago 683-8503, Japan
2. Department of Anatomy, School of Medicine, Faculty of Medicine, Tottori University, Yonago 683-8503, Japan
3. Division of Neurosurgery, Department of Brain and Neurosciences, School of Medicine, Faculty of Medicine, Tottori University, Yonago 683-8503, Japan