1. Institute for Community Medicine, Section Epidemiology of Health Care and Community Health, University of Greifswald, Greifswald
2. Institute of Epidemiology and Social Medicine, University of Münster, Münster
3. The German Migraine and Headache Society (DMKG), Berlin
4. Department of Neurology, University of Münster, Münster
5. Department of Systems Neuroscience, University of Hamburg, Hamburg, Germany