1. Bremerhaven, Germany
2. Centre for Reproductive Medicine and Andrology / Clinical Andrology, University Clinics Muenster, Münster, Germany
3. Department of Epidemiology and Statistics, Boston University School of Public Health, Boston, Massachusetts
4. Department of Urology, University Hospital Hamburg-Eppendorf, Hamburg, Germany
5. Department of Urology and Uro-Oncology, Klinikum Braunschweig, Braunschweig, Germany
6. Institute of Urology and Andrology, Segeberger Kliniken, Norderstedt, Germany
7. Dresden International University, Dresden, Germany
8. Department of Urology, Gulf Medical University, Ajman, United Arab Emirates