1. School of Clinical and Experimental Medicine, University of Birmingham, Birmingham, UK
2. Birmingham Women’s Hospital NHS Foundation Trust, Edgbaston, Birmingham, UK
3. Birmingham Clinical Trials Unit, University of Birmingham, Birmingham, UK
4. School of Health and Life Sciences, Aston University, Birmingham, UK
5. Division of Primary Care, University of Nottingham, Nottingham, UK
6. Health Economics Unit, University of Birmingham, Birmingham, UK
7. Clinical Trials Service Unit, University of Oxford, Oxford, UK