B. Kabengele, P. Akilimali, D. Kaba, P. Kayembe, Z. Kashongwe, and J. Kayembe, “Serum Vitamin D Levels in a Population of Adult Asthmatics in Kinshasa, Democratic Republic of Congo”, IJSBAR, vol. 44, no. 1, pp. 102–114, Feb. 2019.