Barreto, L. P. ., Reis, C. ., Oliveira, D. A. de . and Valença, M. M. (2020) “Ponytail headache (external-traction headache): prevalence, characteristics and relationship with migraine”, Headache Medicine, 11(4), pp. 81–84. doi: 10.48208/HeadacheMed.2020.24.