1. Centre for Trials Research, Cardiff University, Cardiff, UK
2. Tizard Centre, University of Kent, Canterbury, UK
3. Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK
4. Institute of Health and Wellbeing, University of Glasgow, Glasgow, UK
5. Centre for Educational Development Appraisal and Research, University of Warwick, Coventry, UK
6. Challenging Behaviour Foundation, Chatham, UK
7. Division of Psychiatry, Faculty of Brain Sciences, University College London, London, UK