1. Centre for Reviews and Dissemination, University of York, York, United Kingdom
2. All-Ireland Hub for Trials Methodology Research, Queen’s University Belfast, Belfast, United Kingdom
3. Radbound Institue of Health Sciences, Radboudumc, Nijmegen, the Netherlands
4. Research Institute of Primary Care and Health Sciences, Keele University, Keele, United Kingdom (initial work carried out at School of Health and Population Sciences, University of Birmingham, Birmingham, United Kingdom)
5. Centre for Rural Economy, School of Agriculture, Food and Rural Development Newcastle University, Newcastle, United Kingdom (work carried out at the Centre for Reviews and Dissemination, University of York, United Kingdom)
6. MRC Clinical Trials Unit at UCL, London, United Kingdom