biblio.ugent.be The UGent Institutional Repository is the electronic archiving and dissemination platform for all UGent research publications. Ghent University has implemented a mandate stipulating that all academic publications of UGent researchers should be deposited and archived in this repository. Except for items where current copyright restrictions apply, these papers are available in Open Access. This item is the archived peer-reviewed author-version of: Title: The Heterogeneity of Headache Patients Who Self-medicate: a Cluster Analysis Approach Authors: Mehuys, Els, Koen Paemeleire, Geert Crombez, Els Adriaens, Thierry Van Hees, Sofie Demarche, Thierry Christiaens, Lucas Van Bortel, Inge Van Tongelen, Jean Paul Remon In: Pain 157 (7): 1464–1471 To refer to or to cite this work, please use the citation to the published version: Mehuys, Els, Koen Paemeleire, Geert Crombez, Els Adriaens, Thierry Van Hees, Sofie Demarche, Thierry Christiaens, Lucas Van Bortel, Inge Van Tongelen, Jean Paul Remon. 2016. β€œThe Heterogeneity of Headache Patients Who Self-medicate: a Cluster Analysis Approach.” Pain 157 (7): 1464–1471. DOI: 10.1097/j.pain.0000000000000541 1