1. Duke Clinical Research Institute; Duke University; 2400 Pratt Street Durham NC 27705 USA
2. Mazankowski Alberta Heart Institute; University of Alberta; Edmonton Alberta Canada
3. Perelman School of Medicine; University of Pennsylvania; Philadelphia PA USA
4. Inova Heart and Vascular Institute; Fall Church VA USA
5. The Zena and Michael A. Wiener Cardiovascular Institute; Mount Sinai Hospital; New York NY USA
6. Washington University School of Medicine; St. Louis MO USA
7. Brigham and Women's Hospital; Harvard University; Boston MA USA
8. Mayo Clinic; Rochester MN USA