1. Momentum Research, Inc.; 3100 Tower Boulevard; Suite 802 Durham NC 27707 USA
2. University of Brescia; Brescia Italy
3. Merck Research Laboratories; Rahway NJ USA
4. University of Hull; Kingston upon Hull, and National Heart and Lung Institute, Imperial College; London UK
5. University of Iowa Carver College of Medicine Cardiovascular Research Centre; Iowa City IA USA
6. Brigham and Women's Hospital; Boston MA USA
7. Duke Clinical Research Institute; Duke University Medical Center; Durham NC USA
8. University of California; San Francisco and the San Francisco Veterans Affairs Medical Center; San Francisco CA USA
9. Klinika Kardiologii; Wroclaw Poland
10. University Medical Centre Groningen; University of Groningen; Groningen the Netherlands