Srivatsa, S., D. Bose, S. M., and J. C. R. “A Prospective Cohort Study to Evaluate the Correlates of Polypharmacy and Its Association With Depression Among Elderly Patients”. International Journal of Basic & Clinical Pharmacology, vol. 5, no. 5, Jan. 2017, pp. 1984-90, doi:10.18203/2319-2003.ijbcp20163223.