1. Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia, Pennsylvania, Leonard Davis Institute of Health Economics University of Pennsylvania, Philadelphia, Pennsylvania, Department of Family Medicine and Community Health, University of Pennsylvania, Philadelphia, Pennsylvania,
2. Department of Family Medicine and Community Health, University of Pennsylvania, Philadelphia, Pennsylvania, Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia, Pennsylvania
3. Department of Family Medicine and Community Health, University of Pennsylvania, Philadelphia, Pennsylvania, Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia, Pennsylvania, Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia, Pennsylvania
4. Somerset Family Medicine Residency Program, Somerset Medical Center, Somerville, New Jersey