title: Provisional guidelines for measuring disease activity in clinical trials on rheumatoid arthritis.
authors.forename: P L
authors.initials: PL
authors.lastname: van Riel
mesh_terms: D001172:Arthritis, Rheumatoid / Q000503:physiopathology*; D002986:Clinical Trials as Topic; D017408:Guidelines as Topic; D006801:Humans; D012720:Severity of Illness Index