1 Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Chapel Allerton Hospital, Leeds LS7 4SA, UK; NIHR Leeds Biomedical Research Centre, The Leeds Teaching Hospitals NHS Trust, Leeds, UK. Electronic address: [email protected].
2 Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Chapel Allerton Hospital, Leeds LS7 4SA, UK; NIHR Leeds Biomedical Research Centre, The Leeds Teaching Hospitals NHS Trust, Leeds, UK.