1. Wesleyan University, Middletown, Connecticut, USA
2. Yale University School of Medicine, New Haven, Connecticut, USA
3. Brown University School of Medicine, Providence, Rhode Island, USA
4. University of Buffalo, Buffalo, New York, USA
5. Oregon State University, Coravallis, Oregon, USA
6. Penn State University, State College, Pennsylvania, USA
7. University of Arizona, Tucson, Arizona, USA
8. Stanford University, Palo Alto, California, USA
9. University of Kentucky, Lexington, Kentucky, USA
10. Robert Wood Johnson Foundation, Princeton, New Jersey, USA