New placebo-controlled Covid-19 vaccine trials are ethically questionable; it's now about comparative effectiveness and availability of registered vaccines.

J Clin Epidemiol

Department of General Practice, Care and Public Health Research Institute, Faculty of Health, Medicine and Life Sciences, Maastricht University/Maastricht University Medical Centre+, P.O. Box 616, 6200 MD Maastricht, The Netherlands. Electronic address:

Published: May 2021

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7962582PMC
http://dx.doi.org/10.1016/j.jclinepi.2021.03.006DOI Listing

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