1. Division of Neuropsychiatry, Federal University of Pernambuco (UFPE), Recife, Brazil
2. Neurology Unit, Hospital da Restauração, Recife, Brazil
3. Medical School, Uninassau, Recife, Brazil
4. Headache Clinic, Hospital Universitario Oswaldo Cruz, University of Pernambuco (UPE), Recife, Brazil