Residents' Duty Hours and Professionalism Correspondence, N Engl J Med 2009;361:930-931. The first paragraph (page 930) should have ended with, "Although the financial costs incurred in the initial implementation of the rules were substantial and the projected financial costs of further limitations are daunting, another cost, left unaddressed by the IOM task force, is even more troubling to many of us who are involved in graduate medical education. We have transformed the trainees in our core programs from dedicated professionals into shift workers," rather than ". . . troubling to many of us. Our institution has . . . ." We regret the error. The article is correct at NEJM.org.