1. Department of Urology and Andrology, St. John of God Hospital Vienna, Krankenhaus der Barmherzigen Brüder Wien, Vienna, Austria.
2. Department of Urology, St. Elisabeth-Hospital Straubing, Straubing, Germany.
3. Department of Urology, Caritas St. Josef Medical Centre, University of Regensburg, Regensburg, Germany.