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A Randomized Controlled Trial of Negative Co-Payments: The CHORD Trial

American Journal of Managed Care

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Kevin G. Volpp, M.D., Ph.D.; Andrea B. Troxel, Sc.D.; Judith A. Long, M.D.; Said A. Ibrahim, M.D., M.P.H.; Dina H. Appleby, M.S.; J. Otis Smith, Ed.D.; Jalpa A. Doshi, Ph.D.; Jane Jaskowiak, B.S.N.; Marie Helweg-Larsen, Ph.D.; Stephen E. Kimmel, M.D., M.S.C.E.