1. Department of Urology, Hospital Universitari Mútua Terrassa, Terrassa, Barcelona, Spain
2. Department of Paediatrics, Obstetrics & Gynaecology and Preventive Medicine and Public Health, School of Medicine, Autonomous University of Barcelona, Bellaterra, Cerdanyola Del Vallès, Barcelona, Spain
3. Department of Urology, Consorci Sanitari de Terrassa, Terrassa, Barcelona, Spain
4. Department of Clinical Epidemiology, Consorci Sanitari Integral, Hospitalet de Llobregat, Catalonia, Barcelona, Spain