1Institute for Pulmonary Rehabilitation Research, Schön Klinik Berchtesgadener Land, Schönau am Königssee, Germany rainer.gloeckl@gmx.de.
2Department of Pulmonary Rehabilitation, German Center for Lung Research (DZL), Philipps-University, Marburg, Germany.
3Pulmonary Medicine, Zürcher Reha-Zentren, Wald, Switzerland.
4Faculty of Health, University Witten Herdecke, Witten, Germany.
5Kaia Health Software GmbH, Munich, Germany.
6Institute for Pulmonary Rehabilitation Research, Schön Klinik Berchtesgadener Land, Schönau am Königssee, Germany.
7Unabhängige Statistische Beratung Bernhard Ulm, Munich, Germany.
8Department of Medicine, Pulmonary and Critical Care Medicine, German Center for Lung Research (DZL), Philipps-University, Marburg, Germany.
9Teaching Hospital, Paracelsus Medical University, Salzburg, Austria.