1. Department of Neurology, Danish Headache Center, Rigshospitalet Glostrup, Glostrup, Denmark
2. Department of Clinical Experimental Research, Rigshospitalet Glostrup, Glostrup, Denmark
3. Department of Clinical Physiology, Functional Imaging Unit, Nuclear Medicine and PET, Rigshospitalet Glostrup, Glostrup, Denmark
4. Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Charlestown, USA
5. Department of Neurosurgery, Yamaguchi University School of Medicine, Yamaguchi, Japan
6. Department of Biochemistry, Rigshospitalet Glostrup, Glostrup, Denmark
7. Stroke Service, Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Charlestown, USA