1. Patient‐Reported and Clinical Outcomes Research GroupSurgical and Interventional Trials Unit (SITU) London UK
2. Department of Breast SurgeryRoyal Surrey County Hospital NHS Foundation Trust Guildford UK
3. Patient‐Centred and Clinical Outcomes Research GroupUniversity of Bristol, Southmead Hospital Bristol UK
4. Nightingale CentreWythenshawe Hospital Manchester UK
5. Centre for Tumour Biology London UK
6. Department of HistopathologyQueen Elizabeth Hospital Birmingham and University of Birmingham Birmingham UK
7. Centre for Experimental Cancer Medicine, Barts Cancer InstituteQueen Mary University of London London UK
8. SITU, Division of Surgery and Interventional Science, Faculty of Medical SciencesUniversity College London London UK
9. Musculoskeletal Research Unit, Translational Health Sciences, Bristol Medical SchoolUniversity of Bristol, Southmead Hospital Bristol UK
10. Research Design ServiceSouth West University Hospitals Bristol NHS Foundation Trust Bristol UK
11. Division of Surgery, Harry Perkins Institute of Medical Research, Fiona Stanley HospitalUniversity of Western Australia Murdoch Western Australia Australia
12. University of California San Francisco Carol Franc Buck Breast Care Centre San Francisco California USA
13. Division of Surgical Oncology and Endocrine Surgery, Department of SurgeryUniversity of Texas Health Science Centre San Antonio Texas USA
14. Cancer CentreUniversity Hospitals of North Midlands and Keele University Stoke‐on‐Trent UK