[1] Acad Brasileira Neurol, Dept Cient Cefaleia, Sao Paulo, SP, Brazil
[2] Univ Fed Ciencias Saude Porto Alegre, Irmandade Santa Casa Misericordia, Serv Neurol, Porto Alegre, RS, Brazil
[3] Hosp Moinhos Vento, Serv Neurol & Neurocirurgia, Porto Alegre, RS, Brazil
[4] Clin Cefaleia & Neurol Dr Edgard Raffaelli, Sao Paulo, SP, Brazil
[5] Univ Fed Parana, Hosp Clin, Dept Clin Med, Serv Neurol, Curitiba, Parana, Brazil
[6] Ctr Univ Volta Redonda, Volta Redonda, RJ, Brazil
[7] Fundacao Educ Dom Andre Arcoverde, Ctr Ensino Super Valenca, Valenca, RJ, Brazil
[8] Santa Casa Belo Horizonte, Belo Horizonte, MG, Brazil
[9] Univ Estadual Campinas, Fac Ciencias Med, Campinas, SP, Brazil
[10] Hosp Israelita Albert Einstein, Sao Paulo, SP, Brazil
[11] Ctr Univ Barao de Maua, Fac Med, Ribeirao Preto, SP, Brazil
[12] Univ Fed Pernambuco, Recife, PE, Brazil
[13] Clin Neurol Dra Maria Eduarda Nobre, Rio De Janeiro, RJ, Brazil
[14] Univ Sao Paulo, Fac Med, Hosp Clin, Inst Psiquiatria, Sao Paulo, SP, Brazil
[15] Inst Neurol Curitiba, Curitiba, Parana, Brazil
[16] Univ Pernambuco, Hosp Univ Oswaldo Cruz, Ambulatorio Cefaleias, Recife, PE, Brazil
[17] Univ Fed Piaui, Teresina, PI, Brazil
[18] Univ Fed Sao Paulo, Setor Cefaleias, Sao Paulo, SP, Brazil
[19] Headache Ctr Brasil, Sao Paulo, SP, Brazil
[20] Fac Med Barbacena, Barbacena, MG, Brazil
[21] Fundacao Hosp Estado Minas Gerais, Hosp Reg Barbacena Dr Jose Americo, Sao Paulo, SP, Brazil