1. Department of Physical Education and Sport Sciences, National and Kapodistrian University of Athens, 17237 Athens, Greece
2. Institute of Clinical Exercise and Health Science, University of West of Scotland, Hamilton ML3 0JB, UK
3. 1st Department of Critical Care Medicine, National and Kapodistrian University of Athens, 10675 Athens, Greece
4. Thorax Foundation, Research Centre of Intensive and Emergency Thoracic Medicine, 10675 Athens, Greece