1. Division of Cardiovascular Surgery of Pronto Socorro Cardiológico de Pernambuco – PROCAPE, University of Pernambuco, Recife, Brazil
2. Department of Cardiac Surgery, Federal Center for Cardiovascular Surgery, Astrakhan State Medical University, Astrakhan, Russia
3. Department of Cardiovascular Surgery, S.G. Sukhanov Federal Center of Cardiovascular Surgery, E.A. Vagner Perm State Medical University, Perm, Russia
4. Department of Cardiovascular Surgery, I.M. Sechenov University Hospital, First Moscow State Medical University, Moscow, Russia
5. Institut Universitaire de Cardiologie et de Pneumologie de Québec, Quebec Heart and Lung Institute, Quebec, Canada
6. Department of Thoracic and Cardiovascular Surgery, West German Heart and Vascular Center Essen, University Hospital of Essen, University Duisburg-Essen, Essen, Germany