1. Pulmonary Medicine, Zuercher RehaZentren, Klinik Wald, 8636 Wald, Switzerland
2. Department for Pulmonary Medicine, Faculty of Health, University Witten Herdecke, 58455 Witten, Germany
3. Department for History and Philosophy of Medicine, Poznan University of Medical Sciences, 61701 Poznan, Poland
4. Department of Pneumology, Cologne Merheim Hospital, Kliniken der Stadt Koeln, 51109 Koeln, Germany
5. Department of Neurorehabilitation, Zuercher RehaZentren, Klinik Lengg, 8008 Zurich, Switzerland