79 Effect of COVID vaccination on monthly migraine days: A longitudinal cohort study Britt W.H. van der Arend1, Mirthe M. Bloemhof1, Alle G. van der Schoor1, Erik W. van Zwet2, Gisela M. Terwindt1 Affiliations: 1Department of Neurology, Leiden University Medical Center, Leiden, The Netherlands 2Department of Biomedical Data Sciences, Leiden University Medical Center, Leiden, The Netherlands Cephalalgia 2023;43:3331024231198792
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