1 Cardiac Surgery Unit, Glenfield Hospital, University Hospitals of Leicester NHS Trust, Leicester, United Kingdom.
2 Heart and Lung Center, Helsinki University Hospital, Helsinki, Finland; Research Unit of Surgery, Anesthesia and Intensive Care, University of Oulu, Oulu, Finland.
3 Research Unit of Surgery, Anesthesia and Intensive Care, University of Oulu, Oulu, Finland; Heart Center, Turku University Hospital and University of Turku, Turku, Finland. Electronic address: faustobiancari@yahoo.it.