Almeida, O.P., Almeida, S.A., 1999. Short versions of the geriatric depression scale: a study of their validity for the diagnosis of a major depressive episode according to ICD-10 and DMS-IV. Int. J. Geriatr. Psychiatry 14, 858–865.
Aziz, R., Steffens, D.C., 2013. What are the causes of late-life depression? Psychiatr.
Clin. N. Am. 36, 497–516.