1 From the Department of Health Care Policy and the Center for Primary Care, Harvard Medical School, and the Department of Medicine, Massachusetts General Hospital - both in Boston (Z.S.); the Departments of Population Health and Medicine, New York University Grossman School of Medicine, New York (D.A.C.); and Penn Primary Care, Penn Medicine, the Department of Medicine, Perelman School of Medicine, and the Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia (M.J.P.).