Arthritis Research UK Centre for Epidemiology Musculoskeletal Research Group Manchester Academic Health Science Centre University of Manchester Manchester UK

Arthritis Research UK Centre for Epidemiology Musculoskeletal Research Group Manchester Academic Health Science Centre University of Manchester Manchester UK Centre for Integrated Genomic Medical Research Manchester Academic Health Science Centre University of Manchester Manchester UK

Arthritis Research UK Centre for Epidemiology Musculoskeletal Research Group Manchester Academic Health Science Centre University of Manchester Manchester UK The Dermatology Centre Salford Royal NHS Foundation Trust University of Manchester Manchester Academic Health Science Centre Manchester UK

Centre for Integrated Genomic Medical Research Manchester Academic Health Science Centre University of Manchester Manchester UK

Department of Musculoskeletal Biology University of Liverpool Liverpool UK

Feinstein Institute for Medical Research Manhasset New York USA

Institute of Rheumatology Charles University Prague Prague Czech Republic

Laboratory of Translational Immunology University Medical Center Utrecht Utrecht The Netherlands

National Institute of Environmental Health Sciences National Institutes of Health Bethesda Maryland USA

Rheumatology Unit Department of Medicine Karolinska University Hospital Solna Karolinska Institutet Stockholm Sweden

Rheumatology Unit Institute of Child Health University College London London UK

The Dermatology Centre Salford Royal NHS Foundation Trust University of Manchester Manchester Academic Health Science Centre Manchester UK

University of Debrecen Debrecen Hungary

Vall d'Hebron General Hospital Barcelona Spain

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Hindorff LA, MacArthur J, Morales J, European Bioinformatics Institute et al. [accessed 21 Oct 2010];A Catalog of Published Genome-Wide Association Studies. http://www.genome.gov/gwastudies.

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Bohan A, Peter JB. Polymyositis and dermatomyositis (second of two parts) N Engl J Med. 1975;292:403–7. PubMed

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Dense genotyping of immune-related loci in idiopathic inflammatory myopathies confirms HLA alleles as the strongest genetic risk factor and suggests different genetic background for major clinical subgroups