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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... Respiration C08.618.248 Cough C08.618.326 Dyspnea C08.618.326.396 Dyspnea, Paroxysmal C08.618.490 Hoarseness C08.618.490. ... 156 Cardio-Renal Syndrome C14.280.434.313 Dyspnea, Paroxysmal C14.280.434.482 Edema, Cardiac C14. ...
  2. pdfNLM Technical Bulletin, no.93-104 
    https://www.nlm.nih.gov/.../nlmarchives/techbull/93-104-1977.pdf
    ... ALTITUDE SICKNESS ANOXEMIA APNEA CHEYNE-STOKES RESPIRATION COUGH DYSPNEA DYSPNEA, PAROXYSMAL HOARSENESS HYPERCAPNIA HYPERVENTILATION HYPOVENTILATION MOUTH BREATHING ...