1. Department of Health Behavior and Health Education, University of Michigan School of Public Health, Ann Arbor, Michigan, USA.
2. Department of Family Medicine, VA Providence Healthcare System, Providence, Rhode Island, USA.
3. Department of Family Medicine, Alpert Medical School of Brown University, Providence, Rhode Island, USA.
4. Department of Health Services, Policy, and Practice, Brown University School of Public Health, Providence, Rhode Island, USA.