1. Duke Clinical Research Institute; Duke University Medical Center; Durham NC USA
2. Momentum Research, Inc.; Durham NC USA
3. University of Brescia, P.zza Spedali Civili; Brescia Italy
4. University of Hull; Kingston upon Hull UK
5. Brigham and Women's Hospital; Boston MA USA
6. Merck Research Laboratories; Rahway NJ USA
7. Klinika Kardiologii; Wroclaw Poland
8. University of California, San Francisco and the San Francisco Veterans Affairs Medical Center; San Francisco CA USA
9. University Medical Center Groningen, University of Groningen; Groningen The Netherlands