1. Duke Clinical Research Institute, Durham, NC
2. Sunnybrook and Women's College Health Sciences Centre, Toronto, Ont., Canada
3. Vancouver Hospital and Health Sciences Centre, Vancouver, B.C., Canada
4. Cleveland Clinic Foundation, Cleveland, OH
5. Brigham and Women's Hospital, Boston, MA
6. Scripps Clinic and Research Foundation, La Jolla, CA
7. Millennium, Boston, MA
8. University of Wisconsin, Madison, WI