Only 1 link is still working
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Characterising the background incidence rates of adverse events of special interest for covid-19 vaccines in eight countries: multinational network cohort study
https://www.bmj.com/content/373/bmj.n1435
Largest, Most Extensive Measurement
Of Adverse Events Background Rates Can Inform
Safety Monitoring Efforts For COVID Vaccines
https://www.dbmi.columbia.edu/aesi-background-rates-study/
U.S. Population-Based background incidence rates of medical conditions for use in safety assessment of COVID-19 vaccines
https://www.sciencedirect.com/science/article/pii/S0264410X21005788?via%3Dihub
Adverse events following COVID‐19 mRNA vaccines: A systematic review of cardiovascular complication, thrombosis, and thrombocytopenia
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10022421/