1 Department of Health Care Policy, Harvard Medical School, Boston, MA, United States of America; Department of Medicine, Massachusetts General Hospital, Boston, MA, United States of America; Division of Pulmonary & Critical Care Medicine, Massachusetts General Hospital, Boston, MA, United States of America.
2 Department of Health Care Policy, Harvard Medical School, Boston, MA, United States of America; TIMI Study Group, Brigham and Women's Hospital, Boston, MA, United States of America.
3 Department of Economics, Brown University, Providence, RI, United States of America.
4 Department of Health Care Policy, Harvard Medical School, Boston, MA, United States of America.
5 Department of Health Care Policy, Harvard Medical School, Boston, MA, United States of America; Department of Medicine, Massachusetts General Hospital, Boston, MA, United States of America; National Bureau of Economic Research, Cambridge, MA, United States of America. Electronic address: jena@hcp.med.harvard.edu.