1. AMPATH Haematology and Oncology Institute/Moi Teaching and Referral Hospital, Eldoret, Kenya;
2. Moi University School of Medicine, Faculty of Health Sciences, Eldoret, Kenya;
3. International Cancer Institute, Eldoret, Kenya;
4. Indiana Hemophilia and Thrombosis Center, Indianapolis, IN; and
5. Indiana University School of Medicine, Indianapolis, IN