Clinical history of headache, cross-referencing etiological diagnosis and the need for emergency referral, in hospitals in Rio Grande do Sul. Headache Medicine, [S. l.], v. 14, n. Supplement, p. 159, 2023. Disponível em: https://headachemedicine.com.br/hm/article/view/967. Acesso em: 22 jan. 2026.