7 143 Migraine attack incidence in relation to ovulation: a prospective cohort study B.W.H. van der Arend1,2*, S. Bakker1*, D.S. van Casteren1, I.E. Verhagen3, N. Pelzer1,4, I. de Boer1, S.C. Cannegieter5, A. MaassenVanDenBrink2, G.M. Terwindt1 Affliations: 1Department of Neurology, Leiden University Medical Centre, Leiden, The Netherlands 2Division of Vascular Medicine and Pharmacology, Department of Internal Medicine, Erasmus Medical Centre, Rotterdam, The Netherlands 3Department of Neurology, UMC Utrecht, Utrecht, The Netherlands 4Department of Public Health and Primary Care, Health Campus the Hague, Leiden University Medical Centre, the Hague, the Netherlands 5Department of Clinical Epidemiology, Leiden University Medical Centre, Leiden, The Netherlands *Shared first author Submitted
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