1. Vattikuti Urology Institute; Henry Ford Hospital; Detroit MI USA
2. Department of Urology; Marien Hospital Herne; Ruhr-University Bochum; Herne Germany
3. Department of Urology; University Medical Centre Hamburg-Eppendorf; Hamburg Germany
4. Division of Urological Surgery and Center for Surgery and Public Health; Brigham and Women's Hospital; Harvard Medical School; Boston MA USA