1. St George's, University of London; Population Health Research Institute; Cranmer Terrace London UK SW17 0RE
2. UroEvidence@Deutsche Gesellschaft für Urologie; Nestorstr. 8-9 (1. Hof) Berlin Germany 10709
3. IMIM (Hospital del Mar Medical Research Institute); Health Services Research Unit; C/ Doctor Aiguader, 88 Barcelona Spain 08003
4. CIBER en Epidemiología y Salud Pública (CIBERESP); Madrid Spain