Lennon, R. P., C. Griffin, E. L. Miller, H. Dong, D. Rabago, and A. E. Zgierska. “Norovirus Infections Drop 49% in the United States With Strict COVID-19 Public Health Interventions”. Acta Medica Academica, vol. 49, no. 3, Mar. 2021, pp. 278-80, doi:10.5644/ama2006-124.317.