1 Department of Histopathology, Royal Brompton and Harefield NHS Foundation Trust and National Heart and Lung Institute, Imperial College, London, UK.
2 Department of Cellular Pathology, Northwest London Pathology, Imperial College London NHS Trust and Mortuary Lead, Nightingale NHS Hospital, London, UK.
3 Department of Radiology, Royal Brompton and Harefield NHS Foundation Trust, London, UK.
4 Interstitial Lung Disease Unit, Royal Brompton and Harefield NHS Foundation Trust and National Heart and Lung Institute, Imperial College, London, UK.