1. Mental Health and Addiction Research Group, Department of Health Sciences; University of York; York UK
2. Hull York Medical School; University of York; York UK
3. Centre for Reviews and Dissemination; University of York; York UK
4. Cochrane Common Mental Disorders; University of York; York UK
5. Centre for Prognosis Research, School of Medicine; Keele University; Keele UK
6. School of Medicine; Keele University; Keele UK
7. Department of Epidemiology and Biostatistics, Schulich School of Medicine & Dentistry; Western University; London Canada