1. From MedStar Georgetown University Hospital, Washington, DC (J.A.); Albert Einstein College of Medicine and Montefiore Headache Center, New York (R.B.L.); the National Institute for Health Research–Wellcome Trust King’s Clinical Research Facility, King’s College London, London (P.J.G.); the Department of Neurology, University of California, Los Angeles, Los Angeles (P.J.G.); and AbbVie, Madison, NJ (H.G., R.M., L.S., M.F., J.M.T.).