1. Department of Radiology, Royal Brompton Hospital, London, United Kingdom
2. The Interstitial Lung Disease Unit, Royal Brompton Hospital, London, United Kingdom
3. The Margaret Turner-Warwick Centre for Fibrosing Lung Disease, Imperial College London, London, United Kingdom
4. Department of Radiology, Guy's and St Thomas' Hospital, London, United Kingdom
5. National Heart & Lung Institute, Imperial College London, London, United Kingdom