1. Department of Rheumatology, University Hospital, Zurich, Switzerland
2. Department of Medicine, Division of Rheumatology, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
3. Department of Rheumatology, Oslo University Hospital, Oslo, Norway
4. National Institute for Health Research Respiratory Clinical Research Facility, Royal Brompton and Harefield NHS Foundation Trust, and Fibrosis Research Group, National Heart and Lung Institute, Imperial College, London, UK