Diez-Quevedo, C., Rangil, T., Sanchez-Planell, L., Kroenke, K., y Spitzer, R. L. (2001). Validation and Utility of the Patient Health Questionnaire in Diagnosing Mental Disorders in 1003 General Hospital Spanish Inpatients. Psychosomatic Medicine, 63(4), 679–686. https://doi.org/10.1097/00006842-200107000-00021