1. Mental Health and Addiction Research Group, Department of Health Sciences; University of York; York UK
2. Population Health Sciences, Bristol Medical School; University of Bristol; Bristol UK
3. Cochrane Common Mental Disorders; University of York; York UK
4. Lanchester Road Hospital; Tees, Esk and Wear Valleys NHS Foundation Trust; Durham UK
5. South West London and St George's Mental Health NHS Trust; London UK
6. Great Ormond Street Institute of Child Health; University College London; London UK
7. University College London; London UK
8. Centre for Reviews and Dissemination; University of York; York UK