Al Mahdi, K., Albrahim, M., Alkhars, F., Alkhalifah, O., Alaithan, R. and Alhajri, F. (2018) “Relationship between vitamin D deficiency and atopy in children”, International Journal of Contemporary Pediatrics, 5(5), pp. 1705–1709. doi: 10.18203/2349-3291.ijcp20182946.