Barros, M. M. M. B. ., A. da S. . Tonório, T. F. L. D. . Maia, C. C. S. de . Almeida, and D. A. de . Oliveira. “Relation Between Primary Headache and Restriction of Cervical Range of Motion: A Pilot Study”. Headache Medicine, vol. 5, no. 1, Mar. 2014, pp. 14-20, doi:10.48208/HeadacheMed.2014.3.