1 Rheumatology Department, Salford Royal NHS Foundation Trust, Manchester Academic Health Science Centre, Salford.
2 Pennine MSK Partnership Ltd, Integrated Care Centre, Rheumatology, Manchester.
3 Salford Royal NHS Foundation Trust, Manchester Academic Health Science Centre, Salford.
4 Department of Neuropathology, Salford Royal, Manchester.
5 John Walton Muscular Dystrophy Research Centre, MRC Centre for Neuromuscular Diseases, Institute of Genetic Medicine, Newcastle University, Newcastle.
6 National Institute of Health Research Manchester Musculoskeletal Biomedical Research Unit, Central Manchester Foundation Trust, The University of Manchester, Manchester, UK.