1. Rush University Medical CenterChicago Illinois
2. Boston University School of Medicine, Boston, Massachusetts, and University of ManchesterManchester UK
3. Boston University School of MedicineBoston Massachusetts
4. University of Massachusetts Medical SchoolWorcester
5. University of KansasKansas City
6. University of Alabama at Birmingham and Birmingham Veterans Affairs Medical CenterBirmingham Alabama
7. University of CaliforniaSan Francisco