1 Department of Thoracic and Cardiovascular Surgery, West German Heart and Vascular Center Essen, University Hospital of Essen, University Duisburg-Essen, Essen, Germany.
2 Division of Cardiovascular Surgery of Pronto Socorro Cardiológico de Pernambuco - PROCAPE, University of Pernambuco, Recife, Brazil.
3 School of Medicine, Faculty of Health, University of Witten Herdecke, Witten, Germany.