1. Nottingham Centre for Public Health and Epidemiology, School of Medicine, University of Nottingham, Nottingham, UK
2. Nottingham Breast Institute, Nottingham University Hospitals NHS Trust, Nottingham, UK
3. Klinikin Armuli Surgical Centre, Reykjavik, Iceland
4. Nottingham Centre for Evidence-Based Healthcare, Faculty of Medicine and Health Sciences, University of Nottingham, Nottingham, UK