1 Department of Anesthesia and Critical Care, University of Chicago Medical Center, Chicago, Ill.
2 Robotic and Minimally Invasive Cardiac Surgery, Section of Cardiac Surgery, Department of Surgery, University of Chicago Medical Center, Chicago, Ill.
3 Cardiac Surgery, Section of Cardiac Surgery, Department of Surgery, Heart and Vascular Center, University of Chicago Medical Center, Chicago, Ill.
4 Cardiac Anesthesia, Department of Anesthesia and Critical Care, University of Chicago Medical Center, Chicago, Ill. Electronic address: [email protected].