1. Sections of General Internal Medicine, Primary Care Center, Yale University School of Medicine, 333 Cedar Street, P.O. Box 208025, New Haven, CT 06520, USA
2. Section of Cardiovascular Medicine, Department of Medicine, Robert Wood Johnson Clinical Scholars Program, New Haven, CT 06520, USA
3. Department of Epidemiology and Public Health, Yale University School of Medicine, New Haven, CT 06520, USA
4. The Center for Outcomes Research and Evaluation, Yale New Haven Hospital, New Haven, CT 06520, USA