1. Department of Urology, Chang Gung Memorial Hospital at Linkou, Taiwan, Republic of China
2. School of Medicine, Chang Gung University, Taiwan, Republic of China
3. Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang Gung University, Taiwan, Republic of China
4. Department of Anatomy, School of Medicine, Chang Gung University, Kwei-Shan, Tao-Yuan, Taiwan, Republic of China