Najah Rajab Ghoumah, and Mustafa Saieh. “Association Between Serum Vitamin D Levels and Acute Respiratory Tract Infections Among Preschool Children in Gharyan Hospital, Libya”. African Journal of Advanced Pure and Applied Sciences 5, no. 2 (June 15, 2026): 313–322. Accessed July 3, 2026. https://aaasjournals.com/index.php/ajapas/article/view/2031.