Sert, Sadiye, and Alpaslan Taner. “Variations of 25-Hydroxyvitamin D Levels During COVID-19 Pandemic and Its Relation to Season, Sex and Age in Children: 25-Hydroxyvitamin D Levels During COVID-19 Pandemic”. The Journal of Pediatric Academy 5, no. 4 (December 31, 2024): 123–129. Accessed January 18, 2025. https://jpediatricacademy.com/index.php/jpa/article/view/362.