Zieliński, Grzegorz, Michał Ginszt, Zuzanna Filipiak, Marta Suwała, and Piotr Majcher. “Vitamin D Deficiency and Tension-Type Headaches in Children - Literature Review”. Journal of Education, Health and Sport 9, no. 3 (March 24, 2019): 455–464. Accessed September 14, 2024. https://apcz.umk.pl/JEHS/article/view/6725.