Nabel Ahmed A Mansour. “A Statistical Study on Visitors to the Alwatan Laboratory Regarding Vitamin D Deficiency”. African Journal of Advanced Pure and Applied Sciences (AJAPAS) 4, no. 3 (September 25, 2025): 625–630. Accessed December 5, 2025. https://aaasjournals.com/index.php/ajapas/article/view/1557.