This is a descriptive, retrospective, multi-center, cross-sectional and observational epidemiological study of incidence and prevalence of juvenile dermatomyositis in Alsace from 2000 to 2015. Alsace is a French region with a low migratory flow
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Identify incident and prevalent cases of juvenile dermatomyositis according to Bohan and Peter's criteria at january 1st, 2016 via capture/recapture strategy
Timeframe: The period from from January 1st, 2000 to December 31st, 2015 will be examined