Affiliation: | 1. Division of Cardiovascular Surgery, University of Pennsylvania, Philadelphia, Pennsylvania;2. Duke Clinical Research Institute, Duke University Medical Center, Durham, North Carolina;3. Department of Cardiac Surgery, Medstar Heart and Vascular Institute/Georgetown University, Washington, DC;4. Department of Biostatistics and Bioinformatics, Duke University, Durham, North Carolina;5. Columbia University Medical Center, New York, New York;6. Division of Cardiology, University of Pennsylvania, Philadelphia, Pennsylvania;g. Penn Cardiovascular Outcomes, Quality, & Evaluative Research Center, Philadelphia, Pennsylvania |