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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 650.940.800.575.912.250.583.750 Rehmannia B01.650.940.800.575.912.250.583. ...
  2. Excluded Studies - Pharmacologic and Nonpharmacologic Therapies in Adult Patients With Exacerbation of COPD: A ... 
    https://www.ncbi.nlm.nih.gov/books/NBK549047
    ... of Chronic Bronchitis Patients (HL301: Mixed Extract of Rehmannia Glutinosa, Schisandra and so on). 2014 March. PMID: ...