1. Bristol Interstitial Lung Disease Service, North Bristol NHS Trust, Bristol BS10 5NB, UK
2. Liverpool Interstitial Lung Disease Service, Liverpool University Hospitals NHS Foundation Trust, Liverpool L7 8XP, UK
3. Department of Cellular Pathology, North Bristol NHS Trust, Bristol BS10 5NB, UK
4. Department of Radiology, North Bristol NHS Trust, Bristol BS10 5NB, UK
5. North Bristol Lung Centre, North Bristol NHS Trust, Bristol BS10 5NB, UK