Nancy L. Keating Haiden A. Huskamp J. Michael McWilliams Barbara J. McNeil Bruce E. Landon Michael E. Chernew Sharon-Lise Normand Medical Care January 5, 2018 2018 Keating NL, Huskamp HA, Schrag D, McWilliams JM, McNeil BJ, Landon BE Chernew ME, Normand ST https://www.ncbi.nlm.nih.gov/pubmed/29135615