1. Faculty of Medicine, University of Novi Sad, Novi Sad, Serbia
2. Cardiovascular Institute, Azienda Ospedaliero-Universitaria di Ferrara, Ferrara, Italy
3. Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK and
4. Cardiothoracic Centre, Freeman Hospital, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK