1. University of North Carolina at Chapel Hill School of Medicine and Cecil G. Sheps Center for Health Services Research, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina (S.A.B.)
2. Wake Forest School of Medicine, Winston-Salem, North Carolina (D.P., J.R.)
3. University of California San Francisco and Center for Vulnerable Populations at Zuckerberg San Francisco General Hospital and Trauma Center, San Francisco, California (H.K.S.)
4. Center for Primary Care, Harvard Medical School, Boston, Massachusetts, Institute of Health Policy, Management & Evaluation, University of Toronto, Toronto, Ontario, Canada, and School of Public Health, Imperial College London, London, United Kingdom (S.B.).