1. From the Stritch School of Medicine (Swanson, Littau), Loyola University Chicago, Maywood, IL
2. the Department of Surgery (Tonelli, Cohn), Loyola University Medical Center, Maywood, IL
3. the Department of Surgery (Luchette, Baker), Loyola University Medical Center, Stritch School of Medicine, Loyola University Chicago, Maywood, IL
4. the Edward Hines Jr Veterans Administration Medical Center (Luchette, Baker, Abdelsattar).
5. Department of Cardiothoracic Surgery (Abdelsattar), Loyola University Medical Center, Stritch School of Medicine, Loyola University Chicago, Maywood, IL