1. Department of Radiology, Royal Free Hospital, London, United Kingdom;
2. Keck School of Medicine, University of Southern California, Los Angeles, California;
3. National Heart and Lung Institute, Imperial College, London, United Kingdom;
4. Interstitial Lung Disease Unit, and
5. Department of Radiology,
6. Department of Radiology, University College Hospital, London, United Kingdom
7. Department of Histopathology, Royal Brompton Hospital, Guy’s and St Thomas’ National Health Service Foundation Trust, London, United Kingdom; and