1. University of California, Los Angeles, Los Angeles, California;
2. University of Cincinnati, Cincinnati, Ohio;
3. University of North Carolina, Chapel Hill, North Carolina;
4. University of Oklahoma, Oklahoma City, Oklahoma;
5. Stanford University, Stanford, California;
6. University of Pennsylvania, Philadelphia, Pennsylvania;
7. Stowers Institute for Medical Research, Kansas City, Missouri;
8. Oregon Health and Sciences University, Portland, Oregon; and
9. University of Pittsburgh, Pittsburgh, Pennsylvania