77 Defining migraine days 3 ONLINE SUPPLEMENTARY FILES Supplementary Figure 1. Migraine days based on typical migraine characteristics (duration of ≥ 4 hours) vs days defined by triptan intake (effective or not), stratified by chronic migraine (CM), high frequent episodic migraine (HFEM) and low frequent episodic migraine (LFEM). The righthand-side Venn diagrams show the missing migraine characteristics on days defined by triptan intake only.
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