Institution: | 1.Department of Neurology,Universidade Federal Fluminense,Niterói,Brazil;2.Headache Outpatient Unit,Instituto de Neurologia Deolindo Couto,Rio de Janeiro,Brazil;3.Headache Center of Rio,Rio de Janeiro,Brazil;4.Department of Neurology,The Albert Einstein College of Medicine,Bronx,USA;5.Research Department,The New England Center for Headache,Stamford,USA |