Downer, Matthew B., and Samir K. Sinha. “Multimorbidity and COVID-19 in Canada: How the Pandemic Has Highlighted a Key and Yet Underappreciated Risk Factor”. Canadian Geriatrics Journal 25, no. 4 (December 1, 2022): 404–406. Accessed April 19, 2024. https://cgjonline.ca/index.php/cgj/article/view/611.