1. Department of Hematology; Faculty of Medicine and Biomedical Sciences of University of Yaoundé I; Yaoundé Cameroon
2. Hematology & Transfusion Service University Teaching Hospital; Yaoundé Cameroon
3. Department of Public Health; Faculty of Medicine and Biomedical Sciences of University of Yaoundé I; Yaoundé Cameroon
4. Bamenda Regional Hospital; Bamenda Cameroon
5. Essos Hospital Center; Yaoundé Cameroon
6. Department of Public Health; Institute of Tropical Medicine; Antwerp Belgium
7. Institut National de la Transfusion Sanguine; Paris France
8. Blood Systems Research Institute; San Francisco California