1. Department of Haematology, Aminu Kano Teaching Hospital, Kano, Nigeria;
2. eHealth Africa, Kano, Nigeria;
3. Department of Surgery, Aminu Kano Teaching Hospital/Bayero University, Kano, Nigeria;
4. Department of Mathematical Sciences, Bayero University, Kano, Nigeria;
5. School of Medicine, Johns Hopkins University, Baltimore, MD; and
6. Vanderbilt-Meharry Sickle Cell Disease Center of Excellence, Vanderbilt University Medical Center, Nashville, TN