- European Institute of Surgery in Norderstedt near Hamburg, Germany
- Department of Urology, Charite Hospital, Humboldt University, Berlin, Germany.
- Department of Urology, University of Innsbruck, Austria.
- Brady Urological Institute, Johns Hopkins Hospital and Johns Hopkins Bayview Medical Center in Baltimore, USA.
- Department of Urology of the Montsouris Institute in Paris, France.
- Urology Clinic of La Zarzuela University Hospital in Madrid, Spain.
