What The Study Did: The risks of myocarditis and pericarditis after SARS-CoV-2 mRNA vaccinations were assessed by vaccine, dose number, sex and age among 23.1 million residents of Denmark, Finland, Norway and Sweden.
Authors: Rickard Ljung, M.D., Ph.D., M.P.H., of the Swedish Medical Products Agency in Uppsala, Sweden, is the corresponding author.
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(doi:10.1001/jamacardio.2022.0583)
Editor’s Note: Please see the article for additional information, including other authors, author contributions and affiliations, conflicts of interest and financial disclosures, and funding and support.
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JAMA Cardiology