1. York Trials Unit Department of Health Sciences University of York York UK
2. Social Policy Research Unit University of York York UK
3. The Children's Sleep Charity Doncaster UK
4. Sheffield Children's NHS Foundation Trust Sheffield UK
5. Institute for Health and Society Newcastle University Newcastle upon Tyne UK
6. Blackpool Teaching Hospitals NHS Foundation Trust Blackpool UK
7. Centre for Reviews and Dissemination University of York York UK