1. Centre for Surgical Research, School of Social and Community Medicine, University of Bristol, Bristol, UK
2. Royal Liverpool and Broadgreen University Hospitals NHS Trust, Liverpool, UK
3. University Hospitals Bristol Foundation NHS Trust, Bristol, UK
4. Bristol Breast Care Centre, North Bristol NHS Trust, Bristol, UK
5. Centre for Appearance Research, University of the West of England, Bristol, UK
6. Department of Plastic Surgery, North Bristol NHS Trust, Bristol, UK
7. Canniesburn Plastic Surgery Unit, Glasgow, UK
8. Medical Research Council (MRC) North West Hub for Trials Methodology Research, Department of Biostatistics, University of Liverpool, Liverpool, UK