Usefulness of the G8 questionnaire in predicting frailty in elderly patients with metastatic or castration-resistant prostate cancer - Rios, Emilio; Linares-Espinos, Estefania; Ramirez, Raquel; Menendez, Rocio; Ignacio Gonzalez-Montalvo, Juan; Martinez-Pineiro, Luis (ARCHIVOS ESPANOLES DE UROLOGIA, 2022)