1. University of Southern California, Los Angeles, California, USA
2. Emory University, Atlanta, Georgia, USA
3. University of Washington, Seattle, Washington, USA
4. Stanford University, Palo Alto, California, USA
5. University of California, Berkeley, Berkeley, California, USA
6. University of Michigan, Ann Arbor, Michigan, USA
7. Columbia University, New York, New York, USA
8. University of California, Davis, Davis, Califronia, USA
9. National Institute of Environmental Health Sciences (NIEHS), National Institutes of Health (NIH), Department of Health and Human Services (DHHS), Research Triangle Park, North Carolina
10. University of California at San Francisco, San Francisco, California, USA
11. Duke University, Durham, North Carolina, USA
12. University of Colorado, Denver, Colorado, USA
13. National Jewish Health, Denver, Colorado, USA