A. Ekici, S. Yimenicioglu, K. Carman, O. Kocak, C. Yarar, and A. Yakut, “Evaluation of headache in children: a retrospective study”, Eur Res J, vol. 1, no. 3, pp. 136–140, Nov. 2015, doi: 10.18621/eurj.2015.1.3.136.