Leviton 1999.

Methods	Cluster RCT Follow up: providers: DONE patients: N/A Blinded assessment: NOT CLEAR Baseline: DONE Reliable outcomes: DONE Protection against contamination: DONE Overall quality: HIGH
Participants	Estimated 405 obstetricians in 27 hospitals and their preterm delivery cases Country: UK Proportion of eligible providers who participated: 90% Community‐based care Academic/Teaching setting: MIXED Type of targeted behaviour: GENERAL MANAGEMENT OF A PROBLEM (preterm delivery) Complexity of targeted behaviour: MEDIUM
Interventions	1. CME: opinion leaders (one physician and one nurse) appointed from each hospital by the director to serve as local experts + grand rounds lecture on antenatal corticosteroid therapy given by a nationally respected expert + chart reminder system for prompting for therapy + 1‐hour group discussion with scenarios, led by opinion leaders + monitoring care to provide feedback 2. No intervention control
Outcomes	Professional practice: % of patients receiving antenatal corticosteroids Patient: none Seriousness of outcome: HIGH
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Low risk	A ‐ Adequate