Bold, J. S., M. Harris, L. Fellows, and M. Chouchane. “Nutrition, the Digestive System and Immunity in COVID-19 Infection”. Gastroenterology and Hepatology from Bed to Bench, vol. 13, no. 4, Sept. 2020, pp. 331-40, doi:10.22037/ghfbb.v13i4.2094.