Herrera, C., Betancourt Cervantes, J., Lage Dávila, A. ., Barreto Fiu , E., Sánchez Valdés , L., Chávez González, E. and Caballero López , A. (2021) “Variables associated with severity in COVID-19 patients. ”, International Journal of Medical and Surgical Sciences, 8(3), pp. 1–15. doi: 10.32457/ijmss.v8i3.1612.