1. University of California San Francisco, California, USA
2. Westat, Rockville, Maryland, USA
3. Hoxworth Blood Center, Cincinnati, Ohio, USA
4. Blood Bank of San Bernardino and Riverside Counties, San Bernardino, California, USA
5. Oklahoma Blood Institute, Oklahoma City, Oklahoma, USA
6. American Red Cross Blood Services Chesapeake and Potomac, Baltimore, Maryland, USA
7. American Red Cross Blood Services Southeastern Michigan, Detroit, Michigan, USA
8. American Red Cross Blood Services Southern California, Los Angeles, California, USA