Ypanaqué-Luyo, Pedro, and Mônica Martins. “Utilization of Outpatient Health Services in the Peruvian Population”. Revista Peruana De Medicina Experimental Y Salud Pública, vol. 32, no. 3, Sept. 2015, pp. 464-70, https://doi.org/10.17843/rpmesp.2015.323.1675.