1. Laboratory of Cellular Hematology, Division of Blood Components and Devices Office of Blood Research and Review, Center for Biologics Evaluation and Research, Food and Drug Administration Silver Spring Maryland USA
2. Office of Biostatistics and Epidemiology, Center for Biologics Evaluation and Research, Food and Drug Administration Silver Spring Maryland USA
3. Mid‐Atlantic Research Facility, American Red Cross Norfolk Virginia USA
4. American Red Cross Holland Laboratory Rockville Maryland USA