1. From the Headache and Facial Pain Group (S.C., S.K., M.M.), UCL Queen Square Institute of Neurology; The National Hospital for Neurology and Neurosurgery (S.C., F.F., O.P., S.L., S.K., L.Z., M.M., H.A.); Functional Neurosurgery Unit (F.F., O.P., L.Z., H.A.), UCL Queen Square Institute of Neurology; Wellcome Centre for Human Neuroimaging (F.F.), 12 Queen Square; UCL EPSRC Centre for Doctoral Training in Intelligent Integrated Imaging in Healthcare (i4health) (F.F.); Centre for Medical Image Computing...