1. Department of Anesthesiology and Intensive Care Medicine, University Hospital Essen, University Duisburg-Essen, Essen, Germany
2. University Institute of Sports Medicine, Prevention and Rehabilitation, Paracelsus Medical University, Salzburg, Austria
3. Research Institute of Molecular Sports Medicine and Rehabilitation, Paracelsus Medical University, Salzburg, Austria
4. Department of Anesthesiology, Critical Care and Pain Medicine, University Hospital Salzburg, Paracelsus Medical University, Salzburg, Austria
5. Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Boston, Massachusetts
6. Department of Radiology, Paracelsus Medical University, Salzburg, Austria
7. Biomedical Sport Studies Center, University of Ferrara, Ferrara, Italy
8. Department of Epidemiology, Biostatistics and Public Health Institute, University of Zürich, Zurich, Switzerland
9. Hospital of Valais, Sion, Switzerland
10. Department of Anesthesiology and Operative Intensive Care Medicine, Campus Charité Mitte and Virchow-Klinikum, Charité-Universitätsmedizin Berlin, Berlin, Germany
11. Institute for Epidemiology and Medical Biometry, Ulm University, Ulm, Germany
12. Department of Internal Medicine, University of Heidelberg, Heidelberg, Germany
13. Department of Pulmonary, Critical Care and Sleep Medicine, VA Puget Sound Health Care System, University of Washington, Seattle, Washington