1. Northwestern Medicine, Huntley, Illinois, USA.
2. Henry Ford Health System, Detroit, Michigan, USA.
3. University of Rochester, Rochester, New York, USA.
4. Urology Department, Menofia University, Menofia, Egypt.
5. Emory University School of Medicine, Atlanta, Georgia, USA.
6. Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, Ohio, USA.
7. University of California San Diego, San Diego, California, USA.