1. Department of Urology, CU Providencia, Jalisco, México.
2. Department of Urology, Hospital Regional de Alta Especialidad del Bajio, Guanajuato, México.
3. Department of Urology, Hospital Puerta de Hierro, Jalisco, México.
4. Department of Urology, Hospital Regional de Alta Especialidad de la Peninsula de Yucatan, Yucatan, México.
5. Department of Urology, Cottolengo Hospital of Torino, Torino, Italy.