Adamu, A.; Jiya, N.; Ahmed, H.; Ibitoye, P.; Ugege, M.; Sani, U.; Yusuf, T.; Jiya, F.; Isezuo, K. Prevalence of Vitamin A Deficiency Among Malnourished Children in Usmanu Danfodiyo University Teaching Hospital, Sokoto, Northwestern Nigeria. Pak. J. Nutr. 2016, 15 (9), 821–828. https://doi.org/10.3923/pjn.2016.821.828.