Donaldson, Sahai V.; Thomas, Alicia N.; Gillum, Richard F.; Mehari, Alem (January 2021). "Geographic Variation in Racial Disparities in Mortality From Influenza and Pneumonia in the United States in the Pre-Coronavirus Disease 2019 Era". Chest. 159 (6): 2183-2190. doi:10.1016/j.chest.2020.12.029. PMID33400931.
Donaldson, Sahai V.; Thomas, Alicia N.; Gillum, Richard F.; Mehari, Alem (January 2021). "Geographic Variation in Racial Disparities in Mortality From Influenza and Pneumonia in the United States in the Pre-Coronavirus Disease 2019 Era". Chest. 159 (6): 2183-2190. doi:10.1016/j.chest.2020.12.029. PMID33400931.