Association between maternal mRNA covid-19 vaccination in early pregnancy and major congenital anomalies in offspring: population based cohort study with sibling matched analysis by Peter C Austin, Deshayne B Fell, Kumanan Wilson, Astrid Guttmann, Jeffrey C Kwong, Sarah A Buchan, Mina Tadrous, Sarah C J Jorgensen, Rohan D'Souza, Sarah E Wilson, Kevin L Schwartz, Sharifa Nasreen, Kevin A Brown, Samantha S M Drover

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