1. Department of Urology, Fukushima Medical University School of Medicine, 1, Hikarigaoka, Fukushima 960-1295, Japan
2. Department of Urology, Iwase General Hospital, Sukagawa, Fukushima, Japan
3. Department of Urology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
4. Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
5. Department of Urology, Fukushima Medical University School of Medicine, Fukushima, Japan