1. Epidemiology Unit, CPO Piemonte, AOU S. Giovanni Battista, Turin, Italy
2. European Cancer Network (ECN) for Screening and Prevention, Quality Assurance Group, Section of Early Detection and Prevention, International, Agency for Research on Cancer, Lyon, France
3. Institute of Biostatistics and Analyses, Masaryk University, Brno, Czech Republic
4. Swiss Federation of Breast Cancer Screening, Bern, Switzerland
5. NHS Cancer Screening Programmes, Sheffield, UK
6. Department of Research, Cancer Registry of Norway, Oslo, Norway
7. Department of Public Health and Clinical Medicine, Umeá University, Umeá, Sweden
8. Cancer Epidemiology Unit, Department of Cancer Screening, CPO Piemonte, AOU S. Giovanni Battista, Turin, Italy