1. Community Research Initiative of New England, Boston, Massachusetts, USA
2. Hospital Gabriel Mancera IMSS, Mexico City, Mexico
3. Fundacion Huesped, Buenos Aires, Argentina
4. Kaiser Permanente Medical Center, San Francisco, California, USA
5. Hospital La Paz, Madrid, Spain
6. Wroclaw Medical University, Wroclaw, Poland
7. Bristol-Myers Squibb, Wallingford, Connecticut, USA
8. Bristol-Myers Squibb, Pennington, New Jersey, USA