Singh, Gopal K, and Hyunjung Lee. “Marked Disparities in COVID-19 Prevalence by Racial Ethnic, Socioeconomic, Geographic, and Health Care Characteristics, United States, January – April, 2021”. International Journal of Translational Medical Research and Public Health, vol. 5, no. 2, June 2021, pp. 135-48, doi:10.21106/ijtmrph.345.