1. Urology Department, Northern Ontario School of Medicine, Thunder Bay Regional Health Sciences Centre, Thunder Bay, Canada.
2. Urology Department, Menoufia University, Shebin Elkom, Egypt.
3. Urology Department, Urology and Nephrology Hospital, Assiut University, Assiut, Egypt.
4. Radiology Department, Northern Ontario School of Medicine, Thunder Bay Regional Health Sciences Centre, Thunder Bay, Canada.