1. Institute for Community Health Promotion, Brown University Medical School, Providence, RI 02903
2. Tufts University Medical School, HNRC/New England Medical Center Hospital, Boston, MA 02111
3. Department of Clinical Nutrition, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390-8877
4. Department of Epidemiology and Social Medicine, Albert Einstein College of Medicine, Bronx, NY 10461
5. Center for Primary Care and Prevention, Brown Medical School, Memorial Hospital of Rhode Island, Pawtucket, RI 02860