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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 750 Transcranial Direct Current Stimulation E02.331.800 Transcutaneous Electric Nerve Stimulation E02.331.900 Vagus Nerve Stimulation E02.365 ... 699 Spinal Cord Stimulation E02.779.468.800 Transcutaneous Electric Nerve Stimulation E02.779.474 Exercise Movement Techniques E02.779. ...
  2. pdfNLM Technical Bulletin, no.117-128 
    https://www.nlm.nih.gov/.../nlmarchives/techbull/117-128-1979.pdf
    ... criteria of eligibility and observed for pre-defined evidence of favorable and unfavorable effects human only, IM ...