1. Facultad de Medicina, Benemérita Universidad Autónoma de Puebla, 4 Sur #104, Colonia Centro, Puebla de Zaragoza 72000, Mexico
2. Radiation Oncology Service, Bajio Regional High Specialty Hospital, Blvd. Milenio #130, Colonia San Carlos La Roncha, León, Guanajuato 37544, Mexico
3. Oncologic Urology Service, Bajio Regional High Specialty Hospital, Blvd. Milenio #130, Colonia San Carlos La Roncha, León, Guanajuato 37544, Mexico
4. Planning, Teaching and Research Department, Bajio Regional High Specialty Hospital, Blvd. Milenio #130, Colonia San Carlos La Roncha, León, Guanajuato 37544, Mexico