“…They were categorised as focusing on broad strategies (such as the dissemination and implementation of guidelines 5 6 99–11 ), continuing medical education, 12 13 particular strategies (such as audit and feedback, 14 15 computerised decision support systems, 16 17 or multifaceted interventions18), particular target groups (for example, nurses19 or primary healthcare professionals20), and particular problem areas or types of behaviour (for example, diagnostic testing,15 prescribing,21 or aspects of preventive care 15 6 22 – 25 ). Most primary studies were included in more than one review, and some reviewers published more than one review.…”