A Prospective Observational Cohort Comparison of SARS-CoV-2 Seroprevalence Between Paramedics and Matched Blood Donors in Canada During the COVID-19 Pandemic by Grunau, Brian, MD, MHSc, O’Brien, Sheila F., PhD, Kirkham, Tracy L., PhD, Helmer, Jennie, ACP, MEd, Demers, Paul A., PhD, Asamoah-Boaheng, Michael, MPhil, Drews, Steven J., PhD, Karim, Mohammad Ehsanul, PhD, Srigley, Jocelyn A., MD, MSc, Sediqi, Sadaf, BSc, O’Neill, David, PhD, Drennan, Ian R., ACP, PhD, Goldfarb, David M., MD

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