1. Department of Cardiovascular Surgery, Faculty of Medicine Heart Centre Freiburg University, University of Freiburg Freiburg Germany
2. Division of Cardiac Surgery, University Hospital “Shefqet Ndroqi” University of Medicine Tirana Albania
3. Department of Cardiac Surgery, University Hospital Bern University of Bern Bern Switzerland
4. Department of Cardiology and Angiology II University Heart Centre Freiburg‐Bad Krozingen Bad Krozingen Germany