Ribeiro, R. T. ., Gonçalves, A. L. ., Nobre, M. E. ., Carvalho, D. de S. ., & Peres, M. F. P. . (2012). Cluster headache: review of current understandings. Headache Medicine, 3(1), 5–12. https://doi.org/10.48208/HeadacheMed.2012.2