1. Department Urology, Ibri Regional Hospital, Ministry of Health, Al Khdar, Oman
2. Department Urology, Urology and Nephrology Center, Mansoura University, Mansoura, Egypt
3. Department Urology, Faculty of Medicine, Kafr El Sheikh University, Kafr El Sheikh, Egypt
4. Department Urology, Sohar Hospital, Ministry of Health, Muscat, Oman