59 Defining migraine days, based on longitudinal E-diary data Britt W. H. van der Arend1, Iris E. Verhagen1, Matthijs van Leeuwen2, Marnick Q. T. P. van der Arend1, Daphne S. van Casteren1, and Gisela M. Terwindt1 Affiliations: 1Department of Neurology, Leiden University Medical Center, Leiden, The Netherlands 2Leiden Institute of Advanced Computer Science, Leiden University, Leiden, The Netherlands Cephalalgia 2023;43:3331024231166625.
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