Outcome measures for assessing the effectiveness of non-pharmacological interventions in frequent episodic or chronic migraine: a Delphi study by César Fernández-de-las-Peñas, Kerstin Luedtke, Harry von Piekartz, Toby Hall, Annika Basener, Stephanie Bedei, Rene Castien, Mirja Gustafsson, Gwen Jull, Peter Kropp, Bjarne K Madsen, Benjamin Schaefer, Elizabeth Seng, Claudia Steen, Peter Tuchin, Bettina Wollesen

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