Walking ability and its relationship to lower-extremity muscle strength in children with idiopathic inflammatory myopathies11The opinions expressed in this article reflect the views of the authors and are not necessarily those of the National Institutes of Health and the US Public Health Service.No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit on the author(s) or on any organization with which the author(s) is/are associated.