Issues in the study of azathioprine, methotrexate, and combination therapy: comment on the article by Willkens et al.
Madhok
R
R
Menon
N
N
D001172:Arthritis, Rheumatoid / Q000188:drug therapy*; D001379:Azathioprine / Q000627:therapeutic use*; D004359:Drug Therapy, Combination; D006801:Humans; D008727:Methotrexate / Q000627:therapeutic use*
D001379:Azathioprine; D008727:Methotrexate