1. Oxford Centre for Respiratory Medicine; Oxford University Hospitals NHS Foundation Trust; Oxford UK
2. NIHR Oxford Biomedical Research Centre; University of Oxford; Oxford UK
3. Division of Pulmonology and Sleep Disorders Center; University Hospital of Zurich; Zurich Switzerland
4. Department of Physiology, Anatomy and Genetics; University of Oxford; Oxford UK
5. Nuffield Department of Medicine; University of Oxford; Oxford UK
6. Center for Integrative Human Physiology; University of Zurich; Zurich Switzerland