1. COVID-19 Response Team, Centers for Disease Control and Prevention, Atlanta, Georgia
2. Vitalant Research Institute, San Francisco, California
3. Westat, Rockville, Maryland
4. Creative Testing Solutions, Temple, Arizona
5. Scientific Affairs, American Red Cross, Rockville, Maryland
6. Scientific Affairs, American Red Cross, Gaithersburg, Maryland
7. New York Blood Center, New York
8. OneBlood, St Petersburg, Florida
9. Gulf Coast Regional Blood Center, Houston, Texas
10. Bloodworks Northwest, Seattle, Washington
11. Blood Bank of Hawaii, Honolulu
12. Carter BloodCare, Bedford, Texas
13. LifeSouth Community Blood Centers, Gainesville, Florida
14. Versiti, Milwaukee, Wisconsin
15. Blood Bank of Alaska, Anchorage
16. Banco de Sangre de Servicios Mutuos, San Juan, Puerto Rico
17. The Blood Center, New Orleans, Louisiana
18. LifeServe, Des Moines, Iowa
19. Innovative Blood Resources, St Paul, Minnesota
20. Georgia Tech Research Institute, Atlanta
21. University of British Columbia, Vancouver, British Columbia, Canada