@inbook{1144150143, author={Christian T. Ruff and Patrick T. O’Gara}, editor={Cohn, Lawrence H. and Adams, David H.}, title={Preoperative Evaluation for Cardiac Surgery}, booktitle={Cardiac Surgery in the Adult, 5e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2017}, url={accesssurgery.mhmedical.com/content.aspx?aid=1144150143} }