1. Department of Urology and Stone Center, Hara Genitourinary Hospital, Kobe, Hyogo, Japan.
2. Department of Urology, Kobe University, Kobe, Hyogo, Japan.
3. Department of Urology, Gyotoku General Hospital, Ichikawa, Chiba, Japan.
4. Department of Urology, Medical School, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, Japan.