1. Division of Cardiothoracic Surgery, St. Francis Hospital and Medical Center, Hartford, CT USA
2. Structural Heart Research & Innovation Laboratory, Division of Cardiothoracic Surgery, Carlyle Fraser Heart Center, Emory University, Atlanta, GA USA
3. East Carolina Heart Institute, East Carolina University, Greenville, NC USA
4. Cardiovascular Research Centre, University of Free State, Bloemfontein, South Africa.