Thank you Sjaastad (1928-2022) for everything we learned from you. Headache Medicine, [S. l.], v. 13, n. 3, p. 158–159, 2022. DOI: 10.48208/HeadacheMed.2022.13. Disponível em: https://headachemedicine.com.br/hm/article/view/663. Acesso em: 22 jan. 2026.