title: Definition of clinical differences.
authors.forename: Henrica C W
authors.initials: HC
authors.lastname: de Vet
authors.forename: Heleen
authors.initials: H
authors.lastname: Beckerman
authors.forename: Caroline B
authors.initials: CB
authors.lastname: Terwee
authors.forename: Berend
authors.initials: B
authors.lastname: Terluin
authors.forename: Lex M
authors.initials: LM
authors.lastname: Bouter
mesh_terms: D001172:Arthritis, Rheumatoid / Q000473:pathology / Q000503:physiopathology / Q000628:therapy; D004185:Disability Evaluation; D006304:Health Status; D006801:Humans; D012219:Rheumatology / Q000379:methods*; D012720:Severity of Illness Index; D009626:Terminology as Topic