1. Sydney Medical School The University of Sydney Sydney New South Wales Australia
2. Department of Cardiothoracic Surgery Royal North Shore Hospital Sydney New South Wales Australia
3. Department of Cardiothoracic Surgery Weill Cornell Medicine New York New York USA
4. Department of Cardiovascular Surgery Mount Sinai Saint Luke's New York New York USA
5. Department of Cardiovascular Diseases Gemelli Molise Campobasso Italy
6. Division of Cardiac Surgery The Ohio State University Wexner Medical Center Columbus Ohio USA