1. Section of Haematology and Blood Transfusion, Department of Human Pathology, College of Health Sciences, University of Nairobi, Nairobi, Kenya
2. Departments of Oncology and Pharmacology, Moi University School of Medicine, Eldoret, Kenya
3. Department of Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, USA
4. Melvin and Bren Simon Cancer Center, Indiana University, Indianapolis, IN 46202, USA
5. Mary Babb Randolph Cancer Center, West Virginia University, Morgantown, WV 26506, USA