title: Low dose methotrexate pneumonitis in rheumatoid arthritis.
mesh_terms: D000368:Aged; D000542:Alveolitis, Extrinsic Allergic / Q000139:chemically induced*; D001172:Arthritis, Rheumatoid / Q000188:drug therapy; D005260:Female; D006801:Humans; D008727:Methotrexate / Q000008:administration & dosage / Q000009:adverse effects* / Q000627:therapeutic use
chemical_list: D008727:Methotrexate