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*Libro 1CENTERS FOR DISEASE CONTROL AND PREVENTION (2020): «Assessing Risk Factors for Severe COVID-19 Illness». https://www.cdc.gov/coronavirus/2019-ncov/covid-data/investigations-discovery/assessing-risk-factors.html*Libro 2MALLAPAYU S. (2020): «The coronavirus is most deadly if you are old and male», Nature, nº 585, pp. 16-17.*WORKING GROUP FOR THE SURVEILLANCE AND CONTROL OF COVID-19 IN SPAIN (2020): «The first wave of the COVID-19 pandemic in Spain: characterisation of cases and risk factors for severe outcomes, as at 27 April 2020». Disponible en: https://doi.org/10.2807/1560-7917.ES.2020.25.50.2001431*YA-DONG GAO et al. (2021): «Risk factors for severe and critically ill COVID-19 patiens: a review», Allergy, nº 76, pp. 428-455.
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