1. Department of Anesthesia and Intensive Care, AHEPA University Hospital of Thessaloniki, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
2. Department of Anesthesia and Intensive Care, The Royal Brompton and Harefield Hospital NHS, Middlesex, London UB9 6JH, UK
3. Respiratory Medicine Department, Hippokration Hospital, 54942 Thessaloniki, Greece
4. Department of Clinical, Pharmaceutical and Biological Science, School of Life and Medical Sciences, University of Hertfordshire, Hertfordshire AL10 9AB, UK
5. Choremeio Research Laboratory, First Department of Pediatrics, National and Kapodistrian University of Athens, 11527 Athens, Greece
6. Department of Respiratory Medicine, G. Papanikolaou General Hospital, 57010 Thessaloniki, Greece
7. Institute of Critical Care and Anaesthesia, Cleveland Clinic, London W1B 1LU, UK