Study of the Prevalence of Polymyositis and Dermatomyositis in Normandy

"recruitment of patients with polymyositis / dermatomyositis using :~1. medical specialists , hospital and liberals who support patients with polymyositis / dermatomyositis ( internists , dermatologists, neurologists, pulmonologists , rheumatologists ) ;~2. general practitioners~3. the PMSI data for public and private hospitals ; 4 ) data boxes regional health insurance (primary health insurance fund , MSA Normandy , Social Scheme for Self )~5\) Norman patients, members of an association of patients with polymyositis / dermatomyositis : the French Muscular Dystrophy Association"