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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 594.819 Polymyositis C05.651.594.819.500 Dermatomyositis C05.651.594.909 Pyomyositis C05.651.662 ... 575 Polymyositis C10.668.491.562.575.500 Dermatomyositis C10.668.491.562.787 Pyomyositis C10.668. ...