1 Division of Cardiothoracic Anesthesia and Division of General, Vascular and Transplant Anesthesia, Duke University, Durham, NC.
2 Divisions of Cardiothoracic and Vascular and Transplant Anesthesiology, University of North Carolina-Chapel Hill, Chapel Hill, NC.
3 Department of General Anesthesiology, Cleveland Clinic Foundation, Cleveland, OH.
4 Divisions of Cardiothoracic and Vascular and Transplant Anesthesiology, University of North Carolina-Chapel Hill, Chapel Hill, NC. Electronic address: harora@aims.unc.edu.