1. Haematology and Blood Transfusion Service Yaoundé University Hospital Yaoundé Cameroon
2. Faculty of Medicine and Biomedical Sciences University of Yaounde Yaoundé Cameroon
3. Blood Service Yaoundé Central Hospital Yaoundé Cameroon
4. Blood Bank Bafoussam Regional Hospital Bafoussam Cameroon
5. Immunology Catholic University Yaoundé Cameroon
6. Transfusion Medicine University of California San Francisco California USA