1. VA North Texas Health Care System; Dallas
2. Minneapolis Heart Institute; Minneapolis Minnesota
3. University of Texas Southwestern Medical School; Dallas
4. VA Cooperative Studies Program Coordinating Center; Mountain View California
5. San Francisco VA Medical Center; San Francisco California
6. University of California; San Francisco
7. University of Arizona Sarver Heart Center; Tucson
8. Mayo Clinic; Rochester Minnesota
9. VA Boston Healthcare System; Boston Massachusetts
10. Brigham and Women's Hospital Heart and Vascular Center; Boston Massachusetts
11. Harvard Medical School; Boston Massachusetts
12. Durham VA Medical Center; Durham North Carolina
13. Duke University; Durham North Carolina
14. Truven Health Analytics; Ann Arbor Michigan
15. VA Cooperative Studies Program Clinical Research Pharmacy Coordinating Center; Albuquerque New Mexico
16. University of Texas Medical School; Houston
17. Michael E. DeBakey VA Medical Center; Houston Texas
18. VA Health Economics Resource Center; Menlo Park California
19. Stanford University, Department of Surgery; Palo Alto California
20. Stanford University, Department of Biomedical Data Science; Palo Alto California
21. Stanford University, Department of Medicine; Palo Alto California