1 2nd Department of Critical Care, "Attikon" University Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece. Electronic address: grigoriakost@gmail.com.
2 2nd Department of Critical Care, "Attikon" University Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece.
3 Pulmonary Rehabilitation Unit, 1st Department of Respiratory Medicine, National & Kapodistrian University of Athens Medical School, "Sotiria" Hospital for Chest Diseases, Athens, Greece.
4 CRISMA Center, Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, USA.
5 Department of Physiotherapy, Technological and Educational Institution - TEI of Athens, Athens, Greece.
6 Department of Physiotherapy, Technological Educational Institute - TEI of Sterea Ellada, Lamia, Greece.