1 National and Kapodistrian University of Athens, Department of Physical Education and Sports Science; 1st Department of Respiratory Medicine, Pulmonary Rehabilitation Unit; 1st Department of Critical Care Medicine, Pulmonary Rehabilitation Centre, Athens, Greece gianvog@phed.uoa.gr.
2 Yale University School of Medicine, New Haven, CT, USA VA Connecticut Healthcare System, West Haven, CT, USA.
3 Dept of Research and Education, CIRO+, Center of Expertise for Chronic Organ Failure, Horn, The Netherlands REVAL - Rehabilitation Research Center, BIOMED - Biomedical Research Institute, Faculty of Medicine and Life Sciences, Hasselt University, Diepenbeek, Belgium.
4 Katholieke Universiteit Leuven, Department of Rehabilitation Sciences and University Hospital Leuven, Leuven, Belgium.
5 Dept. of Medical and Surgical Sciences, University of Modena and Reggio Emilia, Modena, Italy.