Aloko , S. O., et al. “Nigerians With Sickle Cell Trait (Hb AS) Have More Haematopoietic Stem Cells in Circulation Than Those With Hb AA”. Nigerian Journal of Haematology, vol. 2, no. 1&2, Feb. 2018, pp. 21-27, https://njhaem.org.ng/index.php/home/article/view/35.