1. Division of Urology, Department of Surgery, Kaohsiung Veterans General Hospital, 386 Ta-Chung 1st Road, Kaohsiung 813, Taiwan
2. Division of Urology, Department of Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei 114, Taiwan
3. School of Medicine, National Yang-Ming University, Taipei 112, Taiwan
4. Department of Pharmacy, Tajen University, Pingtung 90741, Taiwan