1. Wayne State University School of Medicine, Detroit, Michigan
2. University of Oklahoma School of Medicine, Oklahoma City, Oklahoma
3. University of California Davis Medical Center, Sacramento, California
4. Duke University Medical Center, Durham, North Carolina
5. University of Texas, Houston, Texas
6. Georgetown University Medical Center, Washington, District of Columbia
7. East Carolina University School of Medicine, Greenville, North Carolina
8. Children's Hospital of Orange County, Orange County, California