1. University of Groningen, University Medical Center Groningen, Department of Pathology and Medical Biology Groningen The Netherlands
2. University of Groningen, University Medical Center Groningen Groningen Research Institute for Asthma and COPD (GRIAC) Groningen The Netherlands
3. University of Groningen, University Medical Center Groningen, Department of Pulmonary Diseases Groningen The Netherlands
4. Centre for Heart Lung Innovation Unive rsity of British Columbia Vancouver Canada
5. Department of Anesthesiology, Pharmacology and Therapeutics University of British Columbia Vancouver Canada
6. Department of Respiratory Medicine Ghent University Hospital Ghent Belgium
7. Department of Epidemiology and Respiratory Medicine Erasmus Medical Center Rotterdam Rotterdam The Netherlands