1. Duke University Medical Center; Durham NC USA
2. Duke Clinical Research Institute; Durham NC USA
3. Mayo Clinic; Rochester MN USA
4. Inova Heart and Vascular Institute; Falls Church VA USA
5. San Francisco Veterans Affairs Medical Center and University of California San Francisco; San Francisco CA USA
6. University of Alberta; Edmonton Alberta Canada
7. Canadian VIGOUR Centre; University of Alberta; Edmonton Alberta Canada
8. Cleveland Clinic Foundation; Cleveland OH USA
9. University of Groningen; Groningen The Netherlands