Alva, Niza, et al. “Risk Factors for Intensive Care Unit Admission or Mortality in Adults Hospitalized for COVID-19 at High Altitude”. Revista Peruana De Medicina Experimental Y Salud Pública, vol. 39, no. 2, June 2022, pp. 143-51, https://doi.org/10.17843/rpmesp.2022.392.10721.