title: Letter: Tetracyclines after 25 years.
mesh_terms: D001991:Bronchitis / Q000188:drug therapy; D002908:Chronic Disease; D006801:Humans; D007674:Kidney Diseases / Q000139:chemically induced*; D013752:Tetracycline / Q000009:adverse effects* / Q000627:therapeutic use; D014508:Urea / Q000097:blood
chemical_list: D014508:Urea; D013752:Tetracycline