D, N. K., and S. TP. “Prevalence of Cognitive Impairment and Depression Among Elderly Patients Attending the Medicine Outpatient of a Tertiary Care Hospital in South India”. International Journal of Research in Medical Sciences, vol. 1, no. 4, Jan. 2017, pp. 359-64, https://www.msjonline.org/index.php/ijrms/article/view/2628.