Cieza Zevallos, Javier, and Celene Uriol Lescano. “Covid 19 Fatality and Mortality in 60 Affected Countries and Their Impact on Demographic, Economic and Health Aspects”. Revista Médica Herediana, vol. 31, no. 4, Jan. 2021, pp. 214-21, doi:10.20453/rmh.v31i4.3852.