1. Department of Surgery, Howard University College of Medicine, Washington, DC, USA
2. Department of Surgery, University of Virginia, Charlottesville, VA, USA
3. Department of Anesthesiology, Case Western Reserve University School of Medicine, Cleveland, OH, USA
4. Department of Medicine, Howard University College of Medicine, Washington, DC, USA
5. Division of Cardiothoracic Surgery, Baylor College of Medicine, Texas Heart Institute, Houston, TX, USA