1 Breast Cancer Surgery Patient Reported and Clinical Outcomes Research Group, School of Clinical Sciences, University of Bristol and North Bristol NHS Trust, Bristol, UK.
2 The Institute of Cancer Research Clinical Trials and Statistics Unit (ICR-CTSU), Division of Clinical Studies, Institute of Cancer Research, London, UK.
3 Centre for Behavioural Medicine, UCL School of Pharmacy, Department of Practice and Policy, London, UK.
4 The Nuffield Department of Surgical Sciences (NDS), John Radcliffe Hospital, Oxford, UK.