[1] Nottingham Univ Hosp NHS Trust, City Hosp Campus,Hucknall Rd, Nottingham NG5 1PB, England
[2] Maidstone & Tunbridge Wells NHS Trust, Maidstone, Kent, England
[3] UCL, Ctr Adv Biomed Imaging, London, England
[4] Royal Prince Alfred Hosp, Sydney, NSW, Australia
[5] Medway Maritime Hosp, Breast Screening Unit, Maidstone, Kent, England