[1] AOU S Giovanni Battista, CPO Piemonte, Epidemiol Unit, I-10123 Turin, Italy
[2] Agcy Res Canc, Sect Early Detect & Prevent, Qual Assurance Grp, European Canc Network ECN Screening & Prevent, Lyon, France
[3] Masaryk Univ, Inst Biostat & Anal, Brno, Czech Republic
[4] Breast Canc Screening Program, Fribourg, Switzerland
[5] Swiss Federat Breast Canc Screening, Bern, Switzerland
[6] NHS Canc Screening Programmes, Sheffield, S Yorkshire, England
[7] Canc Registry Norway, Dept Res, Oslo, Norway
[8] Umea Univ, Dept Publ Hlth & Clin Med, Umea, Sweden
[9] AOU S Giovanni Battista, CPO Piemonte, Canc Epidemiol Unit, Dept Canc Screening, I-10123 Turin, Italy