1. Cardiology Department, Vila Nova de Gaia/Espinho Hospital Centre, Porto, Portugal
2. Cardiothoracic Surgery Department, Vila Nova de Gaia/Espinho Hospital Centre, Porto, Portugal
3. Cardiology Department, Trás-os-Montes e Alto Douro Hospital Centre, Vila Real, Portugal
4. Cardiovascular Research & Development Unit, Department of Physiology and Cardiothoracic Surgery, Faculty of Medicine, University of Porto, Porto, Portugal