1. University of Alabama at BirminghamBirmingham, Alabama
2. Harvard Medical SchoolBoston, Massachusetts
3. Sierra ResearchAlicante, Spain
4. University of Colorado Anschutz Medical CampusAurora, Colorado
5. Los Angeles Biomedical Research Institute at Harbor-UCLA Medical CenterLos Angeles, Californiaand
6. Northwestern University Feinberg School of MedicineChicago, Illinois