Lama-Valdivia, Jaime, et al. “Factors Associated With Mortality in Hospitalized Elders in an Internal Medicine Department”. Revista Peruana De Medicina Experimental Y Salud Pública, vol. 38, no. 2, July 2021, pp. 284-90, https://doi.org/10.17843/rpmesp.2021.382.6982.