Rheumatoid arthritis, methotrexate therapy, and Pneumocystis pneumonia.
Leff
R L
RL
Case
J P
JP
D000368:Aged; D001172:Arthritis, Rheumatoid / Q000188:drug therapy*; D006801:Humans; D008297:Male; D008727:Methotrexate / Q000009:adverse effects* / Q000627:therapeutic use; D011020:Pneumonia, Pneumocystis / Q000209:etiology*
D008727:Methotrexate