1. Group Health, Center for Health Studies, Seattle, Washington.
2. United BioSource Corporation, Bethesda, Maryland.
3. University of Arizona, Tucson, Arizona.
4. Kaiser Permanente Colorado Clinical Research Unit, Denver, Colorado.
5. Kaiser Permanente Northwest Center for Health Research, Portland, Oregon.
6. Genzyme, Cambridge, Massachusetts.
7. Sanofi-Aventis, Bridgewater, New Jersey.