1. Department of Clinical Research, University of Bern, Bern, Switzerland;
2. Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland;
3. Department of Pulmonary Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland;
4. Division of General Thoracic Surgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland;
5. Institute of Functional and Applied Anatomy, Hannover Medical School, Hannover, Germany; and
6. Service de Pneumologie, Hôpital Bichat, Paris, France