1. University Clinic for Cardiac Surgery, Faculty of Medicine, Ss. Cyril and Methodius University of Skopje, 1000 Skopje, North Macedonia
2. Department of Cardiac Surgery, University Hospital Zürich, 8091 Zürich, Switzerland
3. Department of Cardiothoracic Surgery, Helios Klinikum Siegburg, 53721 Siegburg, Germany
4. University Clinic of Cardiology, Faculty of Medicine, Ss. Cyril and Methodius University of Skopje, 1000 Skopje, North Macedonia