Yeldu, M. H., Danjuma, M., Sulaiman, M. A., Muhammad, J. N., Illah, G. B., Ibrahim, Y. and Shehu, B. (2019) “Serum vitamin D status and biochemical parameters of asthmatic children in Sokoto Metropolis, North-western Nigeria”, Asian Journal of Medical Sciences, 11(2), pp. 64–70. doi: 10.3126/ajms.v11i2.26772.