To scan or not to scan in headache.
Peter J
PJ
Goadsby
D001927:Brain Diseases / Q000150:complications* / Q000175:diagnosis; D020773:Headache Disorders / Q000209:etiology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D012017:Referral and Consultation; D014057:Tomography, X-Ray Computed