title: American College of Rheumatology preliminary definition of improvement in rheumatoid arthritis: comment on the article by Felson et al.
authors.forename: A
authors.initials: A
authors.lastname: van Gestel
authors.forename: P
authors.initials: P
authors.lastname: van Riel
mesh_terms: D001172:Arthritis, Rheumatoid / Q000628:therapy*; D006801:Humans; D016896:Treatment Outcome