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OL-C and LG contributed equally.
Contributors Conceptualisation and design: OL-C, LG, OB and YA. Acquisition of data: OL-C, LG, OD, TM, SL, DB, AS, AB, TS, CD, GB, AR, OF, M-CM, CL, M-AV, DV, J-FB, TH, M-PC, ZA, TdB, BE, NB, OB and YA. Analysis and interpretation: OL-C, LG, OB and YA. Critical revision of the manuscript for important intellectual content: OL-C, LG, OD, TM, SL, DB, AS, AB, TS, CD, GB, AR, OF, M-CM, CL, M-AV, DV, J-FB, TH, M-PC, ZA, TdB, BE, NB, OB and YA.
Competing interests OL-C is the recipient of Clinical Fellowship awards from the Université de Montréal Rheumatology Program - Abbvie Educational Grant and the Association des médecins rhumatologues du Québec - Visithan-Khy Educational Grant.
Patient consent for publication Not required.
Ethics approval The study was approved by local Ethics Committee (CPP Ile De France VI (2013-12-19), CCTIRS (N°14.323) and CNIL (915139)) for the use of medical information recorded in the myositis database for scientific purposes.
Provenance and peer review Not commissioned; externally peer reviewed.