1. Department of Clinical Physiology and Nuclear Medicine, Centre for Functional and Diagnostic Imaging and Research, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark
2. Danish Headache Center, Department of Neurology, Rigshospitalet-Glostrup, University of Copenhagen, Copenhagen, Denmark
3. Department of Clinical Physiology, Nuclear Medicine and PET, Rigshospitalet-Glostrup, University of Copenhagen, Copenhagen, Denmark