| Benign Prostatic Hyperplasia (BPH) Male Prospective Study |
| 1. Sapporo Medical University, 2. Saiseikai Otaru Hospital, 3. Hokkaido Health Insurance Hospital, 4. Esashi Prefectural Hospital, 5. Yakumo General Hospital, 6. Akabira City General Hospital, 7. Muroran City Hospital |