Najah Rajab Ghoumah and Mustafa Saieh (2026) “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(2), pp. 313–322. Available at: https://www.aaasjournals.com/index.php/ajapas/article/view/2031 (Accessed: 22 June 2026).