1 Institute of Life Sciences, Scuola Superiore Sant'Anna, Pisa, Italy.
2 Respiratory Physiology Laboratory, Department of Neurology With Institute for Translational Neurology, University of Münster, Münster, Germany.
3 Department of Cardiology I, University Hospital Muenster, Münster, Germany.
4 Cardiology and Cardiovascular Medicine Division, Fondazione Toscana Gabriele Monasterio, National Research Council, CNR-Regione Toscana, Pisa, Italy.
5 Respiratory Rehabilitation Unit, Respiratory Division, University Hospitals Leuven and Department of Rehabilitation Sciences, Leuven, Belgium.
6 Department of Pneumology, Cardiology and Intensive Care Medicine, Klinikum Konstanz, Konstanz, Germany.