1. Dutch Expert Centre for Screening (LRCB); Radboud University Medical Center; PO Box 6873 6503 GJ Nijmegen The Netherlands
2. National Co-ordinating Centre for the Physics of Mammography (NCCPM); Royal Surrey County Hospital; Guildford Surrey GU2 7XX UK
3. Radboud Institute for Health Sciences (RIHS); Radboud University Medical Center; PO Box 9101 6500 HB Nijmegen The Netherlands
4. Department of Physics; University of Surrey; Guildford Surrey GU2 7XH UK
5. Department of Radiology; Academic Medical Centre; Meibergdreef 9 1105 AZ Amsterdam The Netherlands
6. Department of Radiology; Leiden University Medical Centre; Albinusdreef 2 2333 ZA Leiden The Netherlands