1 National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD.
2 Department of Rheumatology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte and Rheumatology Research Unit, Instituto de Medicina Molecular, Universidade de Lisboa, Lisbon, Portugal.
3 Centre for Health and Clinical Research, University of the West of England and University Hospitals and Weston NHS Foundation Trust, Bristol, UK.
4 Te Whatu Ora - Health New Zealand, Auckland, New Zealand.
5 Oxford NIHR Biomedical Research Centre, University of Oxford, Oxford, UK.
6 London School of Hygiene and Tropical Medicine, London, UK.
7 Oxford NIHR Biomedical Research Centre, Nuffield Department of Orthopaedics Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK.
8 Oxford NIHR Biomedical Research Centre, Nuffield Department of Orthopaedics Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK and Norwich Medical School, University of East Anglia, Norwich, UK.
9 Division of Rheumatology, Department of Medicine, Division of Epidemiology, Department of Biostatistics, Epidemiology, and Informatics, University of Pennsylvania, Philadelphia, PA.