The study protocol for a multicenter observational headache registry: Brazilian Headache Registry - REBRACEF II: Registro Brasileiro de Cefaleia - REBRACEF II. Headache Medicine, [S. l.], v. 15, n. 3, p. 175–184/185, 2024. DOI: 10.48208/HeadacheMed.2024.35. Disponível em: https://headachemedicine.com.br/hm/article/view/1301. Acesso em: 22 jan. 2026.