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The heterogeneity of headache patients who self-medicateMehuys, Els; Paemeleire, Koen; Crombez, Geert; Adriaens, Els; Van Hees, Thierry; Demarche, Sophie; Christiaens, Thierry; Van Bortel, Luc; Van Tongelen, Inge; Remon, Jean-Paul; Boussery, Koen · PAIN · 2016