1. School of Nursing, Midwifery and Social Work, University of Manchester, Manchester, UK
2. Department of Social Medicine, University of Bristol, Bristol, Breast Units, Blackpool, UK
3. National Primary Care Research and Development Centre, University of Manchester, Manchester, UK
4. Health Methodology Research Group, University of Manchester, Manchester, UK
5. Blackpool, Fylde and Wyre Hospitals NHS Foundation Trust, Blackpool, UK
6. University Hospital of South Manchester NHS Foundation Trust, Manchester, UK
7. Rosemere Cancer Centre, Royal Preston Hospital, Preston, UK