Awwalu, S., A. Hassan, I. U. Kusfa, A. D. Waziri, I. N. Ibrahim, and G. Yahaya. “Sickle Cell Avascular Necrosis: Prevalence and Clinical Profiles in a Tertiary Hospital Northwestern Nigeria”. Annals of African Medical Research, Vol. 3, no. 1, Oct. 2020, doi:10.4081/aamr.2020.114.