1 Department of Cardiology, Heart Center OLV Aalst, Moorselbaan 164, 9300 Aalst, Belgium.
2 Department of Intensive Care, Royal Brompton and Harefield Hospitals, Guy's & St Thomas' NHS Foundation Trust, cHill End Rd, Harefield, Uxbridge UB9 6JH, UK.
3 Department of Anaesthetics, Pain Management and Intensive Care, Imperial College, Exhibition Rd, South Kensington, London SW7 2AZ, UK.
4 Department of Clinical-Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Corso Strada Nuova, 65, 27100 Pavia, Italy.
5 Anesthesia and Intensive Care, Fondazione Policlinico San Matteo Hospital IRCCS, Pavia, Italy.
6 Department of Cardiology, Heart Center Leipzig at University of Leipzig, Augustusplatz 10, 04109 Leipzig, Germany.