1 Division of Cardiac Surgery, University of Maryland School of Medicine, Baltimore, Md.
2 Division of Cardiothoracic Surgery, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, Tex; Department of Cardiovascular Surgery, Texas Heart Institute, Houston, Tex; CHI St Luke's Health-Baylor St Luke's Medical Center, Houston, Tex. Electronic address: jcoselli@bcm.edu.