1. Perelman School of Medicine, University of PennsylvaniaPhiladelphia
2. Johns Hopkins University School of MedicineBaltimore Maryland
3. UT Southwestern Medical Center and Dallas Veterans Affairs Medical CenterDallas Texas
4. University of North Carolina at Chapel Hill
5. Washington University School of MedicineSt. Louis Missouri
6. Emory University School of MedicineAtlanta Georgia
7. Massachusetts General HospitalBoston
8. Baltimore Veterans Affairs Maryland Health Care SystemBaltimore
9. Texas Children's Hospital and Baylor College of MedicineHouston
10. University of MichiganAnn Arbor