Affiliation: | 1. Department of Surgery, Oulu University Hospital, , Oulu, Finland;2. Division of Cardiac Surgery, University of Verona Medical School, , Verona, Italy;3. Cardiac Surgery Unit, Varese University Hospital, , Varese, Italy;4. Department of Cardiothoracic and Respiratory Sciences, Second University of Naples, , Naples, Italy;5. Cardiac Surgery Unit, Poliambulanza Foundation Hospital, , Brescia, Italy;6. Department of Cardiac Surgery, Klinikum Nürnberg, , Nuremberg, Germany;7. Cardiac Surgery Unit, San Martino University Hospital, , Genoa, Italy |