Sicras-Mainar, Antoni, Ruth Navarro-Artieda, Amador Ruiz-Torrejón, and Alexandra Prados-Torres. 2011. “Estimation of Chronic Co-Morbidity on Health Costs in Elderly Patients With Neurological Disorders”. Revista Peruana De Medicina Experimental Y Salud Pública 28 (3). https://doi.org/10.17843/rpmesp.2011.283.541.