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Research Letter 
David E. Wang, BA; Yusuke Tsugawa, MD, MPH; Jose F. Figueroa, MD, MPH; Ashish K. Jha, MD, MPH

This study investigates whether hospitals with more stars (on the Centers for Medicare and Medicaid Services rating system) have lower risk-adjusted 30-day mortality and readmissions than hospitals with less stars.

Comment & Response 
Charlotte Andersson, MD, PhD

To the Editor We have regretfully discovered an error in our program underlying the analyses of the paper “Association of β-Blocker Therapy With Risks of Adverse Cardiovascular Events and Deaths in Patients With Ischemic Heart Disease Undergoing Noncardiac Surgery: A Danish Nationwide Cohort Study” (2014;174[3]:336-344).1

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