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Contributors Design of the study: PRB, ER, OC and MB. Genetic counselling and clinical management of patients: PRB, CC, JM, ADP, BB, DS-L, EM-F, CN, MDM, MW, SG, DM and OC. Gene analysis: CC, ER, NU, AR, QW and MB. Data collection: PRB, CC, ER, NU, PR, AR, QW, ADP, CT, MW and MB. Data analysis and interpretation: PRB and EMF. Drafting of the manuscript: PRB. Critical review and approval of the manuscript: all authors. Guarantor: PRB.
Competing interests None declared.
Ethics approval Gene analysis was prescribed by cancer geneticists within accredited, institution-approved, cancer genetics clinics. All participating laboratories were accredited by the French National Cancer Institute.
Provenance and peer review Not commissioned; externally peer reviewed.
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