Incorrect Affiliations: In the Original Contribution entitled “Effect of Exposure to Good vs Poor Medical Trainee Performance on Attending Physician Ratings of Subsequent Performances” published in the December 5, 2012, issue of JAMA (2012;308:2226-2232), the affiliations for Drs Yeates and O’Neill are incorrect. The affiliations should read “Schools of Translational Medicine (Dr Yeates) and Medicine (Drs O’Neill and Mann), The Academy at UHSM (Drs Yeates and O’Neill), University of Manchester (Dr Yeates, O’Neill, and Mann), University Hospital of South Manchester (Dr Yeates and O’Neill), Manchester, United Kingdom; . . . ” This article has been corrected online.