1. Nuffield Department of Primary Care Health Sciences University of Oxford Oxford UK
2. Division of Health Sciences, Warwick Medical School University of Warwick Coventry UK
3. Department of Health Sciences University of Leicester Leicester UK
4. Elizabeth Garrett Anderson Institute for Women's Health University College London London UK
5. Department of Psychology University of Warwick Coventry UK
6. Warwick Clinical Trials Unit University of Warwick Coventry UK