Department of Cardiothoracic Surgery, University of Pittsburgh, Pittsburgh, PA, USA; UPMC Heart and Vascular Institute, University of Pittsburgh Medical Center, Pittsburgh, PA, USA. Electronic address: michel_pompeu@yahoo.com.br.

Department of Surgery, Division of Cardiothoracic Surgery, University of North Carolina, Chapel Hill, NC, USA.

Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium.

Department of Cardiothoracic Surgery, University of Pittsburgh, Pittsburgh, PA, USA; UPMC Heart and Vascular Institute, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.

Department of Cardiothoracic Surgery, University of Pittsburgh, Pittsburgh, PA, USA; UPMC Heart and Vascular Institute, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.

Department of Cardiothoracic Surgery, University of Pittsburgh, Pittsburgh, PA, USA; UPMC Heart and Vascular Institute, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.

Department of Cardiothoracic Surgery, University of Pittsburgh, Pittsburgh, PA, USA; UPMC Heart and Vascular Institute, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.

Department of Cardiothoracic Surgery, University of Pittsburgh, Pittsburgh, PA, USA; UPMC Heart and Vascular Institute, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.

Department of Cardiothoracic Surgery, University of Pittsburgh, Pittsburgh, PA, USA; UPMC Heart and Vascular Institute, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.

Department of Cardiothoracic Surgery, University of Pittsburgh, Pittsburgh, PA, USA; UPMC Heart and Vascular Institute, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.

Department of Cardiothoracic Surgery, University of Pittsburgh, Pittsburgh, PA, USA; UPMC Heart and Vascular Institute, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.