1. Department of Pediatrics, Hamamatsu University School of Medicine , Hamamatsu 431-3192 , Japan
2. Department of Pediatrics, University of Pisa , Pisa 56125 , Italy
3. Department of Surgery, University of Pisa , Pisa 56125 , Italy
4. Department of Urology, Fukushima Medical University School of Medicine , Fukushima 960-1295 , Japan
5. Department of Pediatric Urology, Nagoya City University Graduate School of Medical Sciences , Nagoya 467-8601 , Japan
6. Department of Urology Yamagata Tokushukai Hospital , Yamagata 990-0834 , Japan
7. Department of Pediatrics, Keio University School of Medicine , Tokyo 160-8582 , Japan
8. Hamamatsu Child Health and Developmental Medicine , Hamamatsu 431-3192 , Japan
9. Department of Molecular Endocrinology, National Research Institute for Child Health and Development , Tokyo 157-8535 , Japan
10. StaGen Co., Ltd. , Tokyo 111-0051 , Japan
11. Department of Biochemistry, Hamamatsu University School of Medicine , Hamamatsu 431-3192 , Japan
12. Department of Pediatrics, Hamamatsu Medical Center , Hamamatsu 432-8580 , Japan