1. Department of Urology SUNY Downstate Health Sciences University, 450 Clarkson Avenue, Box 79, Brooklyn, New York 11203, USA
2. Department of Urology, SUNY Downstate Health Sciences University, Brooklyn, New York, USA
3. Department of Urology, Ghent University Hospital, Ghent, Belgium
4. Division of Urology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA