1. University of North Carolina, Chapel Hill, and University of Nebraska Medical Center Omaha
2. University of North Carolina Chapel Hill
3. Boston University School of Medicine Boston Massachusetts
4. Keller Army Hospital, West Point, New York, and Uniformed Services University Bethesda Maryland
5. Keller Army Hospital West Point New York
6. Duke University School of Medicine Durham North Carolina
7. Lund University Lund Sweden
8. Uniformed Services University, Bethesda, Maryland, and Intermountain Healthcare Salt Lake City Utah