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The study protocol for a multicenter observational headache registry: Brazilian Headache Registry - REBRACEF II: Registro Brasileiro de Cefaleia - REBRACEF II. Headache Med [Internet]. 2024 Sep. 30 [cited 2026 Jan. 22];15(3):175-184/185. Available from: https://headachemedicine.com.br/hm/article/view/1301