Methotrexate and rheumatoid arthritis.
D001172:Arthritis, Rheumatoid / Q000188:drug therapy*; D001379:Azathioprine / Q000627:therapeutic use; D006801:Humans; D008727:Methotrexate / Q000627:therapeutic use*; D012107:Research Design
D001379:Azathioprine; D008727:Methotrexate