1. Clinical Trials Research Centre, University of Liverpool, Liverpool, UK
2. Ysbyty Gwynedd, Betsi Cadwalladr University Health Board, Bangor, UK
3. Wolfson Centre for Personalised Medicine, University of Liverpool, Liverpool, UK
4. School of Medicine, Cardiff University, Cardiff, UK
5. Centre for Economics and Policy in Health, Bangor University, Bangor, UK
6. Department of Biostatistics, University of Liverpool, Liverpool, UK
7. Department of Health Sciences, University of York, York, UK
8. College of Medicine, Swansea University, Swansea, UK
9. North Wales Centre for Primary Care Research, Bangor University, Bangor, UK
10. Medical Biochemistry & Immunology, University Hospital of Wales, Cardiff, UK
11. Centre for Mental Health & Society, Bangor University, Bangor, UK
12. Clinical Trials Unit, University College London, London, UK
13. Department of Psychological Medicine, University of Otago, Christchurch, NZ
14. North Wales Organisation for Randomised Trials in Health, Bangor University, Bangor, UK