title: Prognostic markers of activity and damage in rheumatoid arthritis: why clinical trials and inception cohort studies indicate more favourable outcomes than studies of patients with established disease.
authors.forename: T
authors.initials: T
authors.lastname: Pincus
authors.forename: L F
authors.initials: LF
authors.lastname: Callahan
mesh_terms: D001172:Arthritis, Rheumatoid / Q000150:complications / Q000473:pathology; D002986:Clinical Trials as Topic; D015331:Cohort Studies; D006801:Humans; D011379:Prognosis; D012720:Severity of Illness Index