Brainstem tumor as a cause of headache triggered by Valsalva maneuver. Headache Medicine, [S. l.], v. 12, n. 1, p. 70–71, 2021. DOI: 10.48208/HeadacheMed.2021.15. Disponível em: https://headachemedicine.com.br/hm/article/view/454. Acesso em: 22 jan. 2026.