1. Department of Medicine, Faculty of Medicine, Imperial College London, London, UK
2. Department of Thoracic and Cardiovascular Surgery, West German Heart and Vascular Center Essen, University Hospital of Essen, University Duisburg-Essen, Essen, Germany
3. Department of Cardiovascular Diseases, University Hospitals Leuven, KU Leuven, Leuven, Belgium
4. Department of Cardiovascular Surgery, Pronto Socorro Cardiológico de Pernambuco (PROCAPE), Recife, University of Pernambuco, Recife, Brazil
5. Department of Cardiothoracic Surgery, Maastricht University Medical Center, Maastricht, Netherlands