Abstract
The present study is a part of a project previously approved by the local ethics committee (Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo - HC/FMUSP - CAPPesq).1. Dermatomyositis and polymyositis Dermatomyositis (DM) and polymyositis (PM) are rare diseases characterized by chronic, systemic, idiopathic, autoimmune inflammatory myopathy, which is associated wi…