title: Combination therapy in rheumatoid arthritis--study design.
mesh_terms: D001172:Arthritis, Rheumatoid / Q000188:drug therapy*; D002986:Clinical Trials as Topic; D004359:Drug Therapy, Combination; D006801:Humans; D010396:Penicillamine / Q000627:therapeutic use*; D012460:Sulfasalazine / Q000627:therapeutic use*
chemical_list: D012460:Sulfasalazine; D010396:Penicillamine