1. Division of Urology, Department of Surgery, Taichung Veterans General Hospital, Taichung 407, Taiwan
2. Department of Urology, An Nan Hospital, China Medical University, Tainan City 833, Taiwan
3. Division of Urology, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung 807, Taiwan
4. Center for Shock Wave Medicine and Tissue Engineering, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 807, Taiwan