External validation of the 4C mortality score among COVID-19 patients admitted to hospital in Ontario, Canada: a retrospective study by Aaron Jones, Tyler Pitre, Mats Junek, Jessica Kapralik, Rina Patel, Edward Feng, Laura Dawson, Jennifer L. Y. Tsang, MyLinh Duong, Terence Ho, Marla K. Beauchamp, Andrew P. Costa, Rebecca Kruisselbrink, the COREG Investigators

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