1. Graduate Institute of Clinical Medical Sciences; College of Medicine; Chang Gung University; Taoyuan Taiwan
2. Division of Colon and Rectal Surgery; Department of Surgery; Chang Gung Memorial Hospital; Chiayi Taiwan
3. Department of Anatomic Pathology; Chang Gung Memorial Hospital; Chiayi Taiwan
4. Division of Urology; Department of Surgery; Chang Gung Memorial Hospital; Chiayi Taiwan