Nogueira, G. N. (2023) “Clinical history of headache, cross-referencing etiological diagnosis and the need for emergency referral, in hospitals in Rio Grande do Sul”, Headache Medicine, 14(Supplement), p. 159. Available at: https://headachemedicine.com.br/index.php/hm/article/view/967 (Accessed: 21 December 2025).