1. MedStar Health Research Institute; Washington District of Columbia, USA
2. Weill Medical College of Cornell University; New York New York, USA
3. University of Texas; Houston Texas, USA
4. Baylor College of Medicine; Houston Texas, USA
5. Johns Hopkins University; Baltimore Maryland, USA
6. The Queen's Medical Center; Honolulu Hawaii, USA
7. University of Pennsylvania; Philadelphia Pennsylvania, USA
8. Oregon Health & Science University; Portland Oregon, USA
9. RTI International, Research Triangle Park; North Carolina, USA
10. University of Michigan; Ann Arbor Michigan, USA