title: Toxicity of combination therapies in rheumatoid arthritis: comment on the article by Willkens et al.
authors.forename: C M
authors.initials: CM
authors.lastname: Stein
mesh_terms: D018501:Antirheumatic Agents / Q000633:toxicity*; D001172:Arthritis, Rheumatoid / Q000188:drug therapy*; D001379:Azathioprine / Q000633:toxicity*; D004359:Drug Therapy, Combination; D006801:Humans; D008727:Methotrexate / Q000633:toxicity*
chemical_list: D018501:Antirheumatic Agents; D001379:Azathioprine; D008727:Methotrexate