1. Department of Urology, Urology and Nephrology Center, Mansoura University, Mansoura, Egypt
2. Department of Urology, Faculty of Medicine, Kafrelsheikh University, Kafrelsheikh, Egypt
3. Glasgow Urological Research Unit, Department of Urology, Queen Elizabeth University Hospital, Glasgow, UK
4. School of Medicine, Dentistry and Nursing, University of Glasgow, Glasgow, UK
5. Department of Urology, Damanhour International Medical Institute, Beheira, Egypt