Slicer  4.13
Slicer is a multi-platform, free and open source software package for visualization and medical image computing

Texts → SubjectHierarchy Relation

File in Modules/Loadable/TextsIncludes file in Modules/Loadable/SubjectHierarchy
SubjectHierarchyPlugins / qSlicerSubjectHierarchyTextsPlugin.hWidgets / qSlicerSubjectHierarchyAbstractPlugin.h