Fortes, Y. M. L., Erudilho, E., Silva, T. S. da, Souza, W. P. de O., & Silva-Neto, R. (2022). Secondary hypnic headache: A literature review in the last 34 years. Headache Medicine, 13(3), 163–166. https://doi.org/10.48208/HeadacheMed.2022.15