Lima, Maria Clea Marinho, Giovanni Silveira Maioli, and Marcelo Moraes Valença. “Red Flags for Secondary Headaches: Challenges in Clinical Practice”. Headache Medicine 13, no. 4 (December 31, 2022): 242–248. Accessed May 9, 2024. https://headachemedicine.com.br/index.php/hm/article/view/740.