1. Serviço de Reumatologia, Hospital de Braga , Braga, Portugal
2. Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds , Leeds, UK
3. National Institute for Health and Care Research Leeds Biomedical Research Centre, Leeds Teaching Hospitals NHS Trust , Leeds, UK
4. Department of Rheumatology, Leeds Teaching Hospitals NHS Trust , Leeds, UK