Elfadil, G. A., Mohammed, N. A., Elmugadam, A., Ismail, M., Altoum, A. E. A. and Osman, A. L. (2021) “Vitamin D Deficiency among Females with Acne Vulgaris in Relation to Sun Exposure: A Cross-sectional Study”, Open Access Macedonian Journal of Medical Sciences, 9(B), pp. 1301–1304. doi: 10.3889/oamjms.2021.7140.