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Headache in patients with inflammatory bowel disease: Migraine prevalence according to the Migraine Screening-Questionnaire (MS-Q) and headache characteristics Alicia Gonzalez-Martinez; Inés Muro; Sonia Quintas; María Chaparro; Javier P. Gisbert; Ancor Sanz-García; María José Casanova; Cristina Rubín de Célix; José Vivancos; Ana Beatriz Gago-Veiga;