1. Baylor College of Medicine, Houston, Texas
2. Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
3. Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas
4. University of Texas Health Science Center at Houston, Houston, Texas
5. University of Mississippi School of Medicine, Jackson, Mississippi
6. University of Texas–Southwestern Medical Center, Dallas, TX
7. Johns Hopkins School of Medicine, Baltimore, Maryland