Affiliation: | 1.Hospital da Luz Headache Center, Hospital da Luz, Lisboa, Avenida Lusíada n 100, 1500-650, Lisbon, Portugal ;2.Headache Outpatient Clinic, Hospital de Santa Maria, Lisbon, Portugal ;3.Lisbon Faculty of Medicine, University of Lisbon, Lisbon, Portugal ;4.Pharmacy Department, Universidade Federal do Rio Grande do Norte, Natal, Brazil ; |