1 Department of Rheumatology, Immunology, and Allergology, Inselspital, University Hospital Bern, Bern, Switzerland.
2 Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham.
3 Department of Rheumatology, National Institute for Health Research (NIHR) Birmingham Biomedical Research Centre, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK.