title: Pneumonitis during low-dose methotrexate therapy.
mesh_terms: D001172:Arthritis, Rheumatoid / Q000188:drug therapy*; D001241:Aspirin / Q000009:adverse effects*; D004347:Drug Interactions; D006801:Humans; D008727:Methotrexate / Q000009:adverse effects*; D011014:Pneumonia / Q000139:chemically induced*
chemical_list: D001241:Aspirin; D008727:Methotrexate