Strengths and limitations
The study design made it possible to test three different intervention components in a more efficient approach than if individual experiments had been conducted.First, the clinical vignette described a hypothetical patient with LS but the specific patient characteristics that may affect GPs’ willingness to prescribe, such as patient age and other medication use, are likely to vary widely among the LS population. The current study only measured GPs’ hypothetical willingness to prescribe aspirin; prescribing behaviour may be different in clinical practice.The sample of GPs was derived via a market research company and may not be typical of the wider GP community. Finally, a ceiling effect of willingness to prescribe aspirin for preventive therapy may have been encountered, beyond which it becomes difficult to influence the outcome.