1 Department of Respiratory Medicine, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.
2 Department of Radiology, Kings College Hospital Foundation Trust, London, UK.
3 Department of Radiology, Royal Brompton and Harefield NHS Foundation Trust, London, UK.
4 Department of Respiratory Medicine, Thomayer Hospital and 1st Medical Faculty of Charles University, Prague, Czech Republic.
5 Hospices Civils de Lyon, Louis Pradel Hospital, Department of Respiratory Diseases, National Reference Centre for Rare Pulmonary Diseases, Regional Competence Centre for Severe Pulmonary Arterial Hypertension, Claude Bernard University Lyon 1, INRA, UMR754, Lyon, France.
6 Department of Chest Diseases, Faculty of Medicine, Pamukkale University, Denizli, Turkey.
7 Department of Medical-Surgical Sciences and Advanced Technologies, Radiology Unit 1, University Hospital "Policlinico-Vittorio Emanuele", Catania, Italy.
8 Respiratory Department, Ospedale San Giuseppe MultiMedica IRCCS, Milano, Italy.
9 UOC Pneumologia, Università Cattolica del Sacro Cuore, Rome, Italy.
10 Regional Centre for Interstitial and Rare Lung Diseases, Department of Clinical and Molecular Biomedicine, University Hospital "Policlinico-Vittorio Emanuele", Catania, Italy.
11 Interstitial Lung Unit, Royal Brompton and Harefield NHS Foundation Trust, London, UK. Electronic address: athol.wells@rbht.nhs.uk.