J. Morales, M. R. Basilio-Rojas, M. R. Gonzales-Gonzales, and A. P. Goyzueta "Primary Healthcare Response to COVID 19 in a District of Callao, Peru", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 864–868, 2020, doi: 10.25046/aj0505105.