1. Klinik für Urologie, Luzerner Kantonsspital, Luzern, Switzerland
2. Clinica Luganese Moncucco, Lugano, Switzerland
3. Clinica S. Anna, Sorengo, Switzerland
4. Clinica S. Chiara, Locarno, Switzerland
5. Department of Business Economics, Health and Social Care, Research Methodology Competence Centre, University of Applied Sciences and Arts of Southern Switzerland, Manno, Switzerland
6. Department of Urology, Ospedale F. Miulli, Acquaviva delle Fonti, Bari, Italy