1. Division of Health Sciences Department of Pediatric and Family Nursing Graduate School of Medicine Osaka University Suita Osaka Japan
2. Department of Urology Kobe Children's Hospital Kobe Hyogo Japan
3. Department of Urology Japan Community Health‐care Organization Hoshigaoka Medical Center Hirakata Osaka Japan
4. Division of Pediatric Urology Riley Hospital for Children at Indiana University Health Indianapolis Indiana USA
5. Department of Biostatistics and Data Science Graduate School of Medicine Osaka University Suita Osaka Japan