1 Department of Cardiac and Vascular Anaesthesia, General Hospital "G. Papanikolaou, " Thessaloniki, Greece - dodasarri@yahoo.gr.
2 Department of Anesthetics, Guy's and St. Thomas' NHS Foundation Trust, London, UK - dodasarri@yahoo.gr.
3 Department of Respiratory Medicine, General Hospital "G. Papanikolaou, " Thessaloniki, Greece.
4 Intensive Care Unit, Department of Anesthesiology and Intensive Care, AHEPA University Hospital of Thessaloniki, Aristotle University of Thessaloniki, Thessaloniki, Greece.