1. Yale School of Medicine, New Haven, Connecticut, USA
2. Boston University, Boston, Massachusetts, USA
3. Tufts Medical Center, Boston, Massachusetts, USA
4. UT Southwestern Medical Center, Dallas, Texas, USA
5. Maine Medical Center, Portland, ME, USA
6. Tufts University School Of Medicine, Boston, Massachusetts, USA
7. Minnesota Department of Health, St. Paul, Minnesota, USA
8. Denver Health, Denver, Colorado, USA
9. University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
10. University of Kentucky, Lexington, Kentucky, USA
11. Emory University, Atlanta, Georgia, USA