1. Department of Urology, Suez Canal University, P.O. Box 224, Ismailia 41522, Egypt
2. Department of Urology, King Khalid Hospital, P.O. Box 1985, Al-Kharj 11942, Saudi Arabia
3. Department of Urology, Al-Azhar University, Nasr City, Cairo 11884, Egypt
4. Department of Urology, Salman Bin Abdul-Aziz University, P.O. Box 173, Al-Kharj 11942, Saudi Arabia
5. Department of Urology, Faculty of Medicine, Zagazig University, P.O. Box 203, Zagazig 44519, Egypt
6. Department of Urology, King Abdallah Hospital, P.O. Box 60, Bisha 61922, Saudi Arabia
7. Department of Urology, Insurance Hospital, Ismailia 41528, Egypt