1. Faculty of Physical Education and Sport Sciences, National and Kapodistrian University of Athens, Athens, Greece;
2. Department of Critical Care Medicine and Pulmonary Services, Evangelismos Hospital, “M. Simou and G.P. Livanos Laboratories”, National and Kapodistrian University of Athens, Athens, Greece;
3. Institute of Physiology, Charité Campus Benjamin Franklin, Berlin, Germany;
4. Institute of Anesthesiology, German Heart Institute, Berlin, Germany;
5. Department of Medicine, University of California San Diego, La Jolla, California;
6. Institute of Clinical Exercise & Health Sciences, University of the West of Scotland, Hamilton, United Kingdom