1 From the Departments of Neurology (M.A.L., G.M.T.) and Psychiatry (M.A.L.), Leiden University Medical Center, the Netherlands; and Department of Neurology (M.S.R.), Montefiore Headache Center, Albert Einstein College of Medicine, Bronx, NY.
2 From the Departments of Neurology (M.A.L., G.M.T.) and Psychiatry (M.A.L.), Leiden University Medical Center, the Netherlands; and Department of Neurology (M.S.R.), Montefiore Headache Center, Albert Einstein College of Medicine, Bronx, NY. g.m.terwindt@lumc.nl.