1. Loyola University Medical Center Department of Cardiology
2. University of Nebraska Medical Center Division of Cardiology
3. The Olga and Lev Leviev Heart Center Sheba Medical Center Ramat Gan, Israel; The Sackler School of Medicine, Tel Aviv University Tel AvivIsrael
4. University of Nebraska Medical Center Department of Cardiothoracic Surgery
5. Loyola University Medical Center Department of Cardiothoracic Surgery