@inbook{55912679, author={Christian T. Ruff and Patrick T. O'Gara}, editor={Cohn, Lawrence H.}, title={Chapter 9. Preoperative Evaluation for Cardiac Surgery}, booktitle={Cardiac Surgery in the Adult, 4e}, publisher={The McGraw-Hill Companies}, address={New York, NY}, year={2012}, url={accesssurgery.mhmedical.com/content.aspx?aid=55912679} }