1. Centre for Epidemiology Versus Arthritis, Division of Musculoskeletal and Dermatological Sciences, The University of Manchester, Manchester Academic Health Science Centre, Manchester, UK
2. National Institute of Health Research Manchester Biomedical Research Centre, Manchester University NHS Foundation Trust, Manchester, UK
3. German Rheumatism Research Centre, Epidemiology Unit, Berlin, Germany
4. Department of Rheumatology and Clinical Immunology, Charité University Medicine, Berlin, Germany