1. Department of Urology, Kagawa University Faculty of Medicine, Kagawa, Japan
2. Department of Epidemiology and Healthcare Research, Graduate School of Medicine and Public Health, Kyoto University, Kyoto, Japan
3. Department of Physical Medicine and Rehabilitation, Tohoku University Graduate School of Medicine, Tohoku, Japan
4. Department of Urology, Tohoku University Graduate School of Medicine, Tohoku, Japan
5. Department of Urology, Kyoto University Graduate School of Medicine, Kyoto, Japan