1. Department of Urology, Al-Azhar University, Cairo, Egypt.
2. Department of Urology, Salman Bin Abdul-Aziz University, Al-Kharj, Kingdom of Saudi Arabia.
3. Royal Commission Hospital, Jubail, Kingdom of Saudi Arabia.
4. King Khalid Hospital, Tabouk, Kingdom of Saudi Arabia.
5. Department of Urology, Suez Canal University, Ismailia, Egypt.
6. Department of Urology, King Khalid hospital, Al-Kharj, Kingdom of Saudi Arabia.