1. Department of Cardiac Surgery, European Medical School Oldenburg‐Groningen Carl von Ossietzky University Oldenburg Oldenburg Germany
2. Department of Cardiovascular Surgery The Pronto Socorro Cardiológico de Pernambuco (PROCAPE) Recife Brazil
3. Department of Thoracic and Cardiovascular Surgery, West German Heart and Vascular Center Essen University Hospital of Essen, University Duisburg‐Essen Essen Germany