1. Keck School of Medicine of the University of Southern California, Los Angeles, California.
2. University of California Davis, Davis, California.
3. Shands Jacksonville Medical Center, Jacksonville, Florida.
4. York Hospital, York, Pennsylvania.
5. Advocate Christ Medical Center, Oak Lawn, Illinois.
6. Cook County Hospital, Chicago, Illinois.
7. Highland General Hospital, Oakland, California.
8. University of Nevada School of Medicine, Las Vegas, Nevada.