title: [How participation in a clinical trial affects doctors' choice of treatment].
abstract: In a retrospective cohort study, the effects of participation in a company-sponsored clinical trial on asthma drug prescribing were investigated. Ten trial-conducting practices were compared with 165 control practices. Conducting the trial did not influence guideline adherence measured as the prevalence of inhaled corticosteroid use among users of inhaled beta2-agonists. However, participation in the trial led to an increased preference for sponsor's drugs.
authors.affiliation: Syddansk Universitet, Forskningsenheden for Almen Praksis i Odense. mandersen@health.sdu.dk
authors.forename: Morten
authors.initials: M
authors.lastname: Andersen
authors.forename: Jakob
authors.initials: J
authors.lastname: Kragstrup
authors.forename: Jens
authors.initials: J
authors.lastname: Sørensen