title: Reply to H. Ian Robins.
authors.affiliation: ISPUP - EPI Unit, University of Porto, Rua das Taipas, nº135, 4050-600, Porto, Portugal; Department of Clinical Epidemiology, Predictive Medicine and Public Health, Faculty of Medicine, University of Porto, Al. Prof. Hernâni Monteiro, 4200-319, Porto, Portugal.
authors.forename: Luis
authors.initials: L
authors.lastname: Ruano
authors.affiliation: ISPUP - EPI Unit, University of Porto, Rua das Taipas, nº135, 4050-600, Porto, Portugal; Portuguese Institute of Oncology of Porto, Rua Dr. António Bernardino de Almeida, 4200-075, Porto, Portugal.
authors.forename: Susana
authors.initials: S
authors.lastname: Pereira
authors.affiliation: ISPUP - EPI Unit, University of Porto, Rua das Taipas, nº135, 4050-600, Porto, Portugal.
authors.forename: Filipa
authors.initials: F
authors.lastname: Fontes
authors.affiliation: Institute of Public Health, University of Porto, Rua das Taipas, nº135, 4050-600, Porto, Portugal.
authors.forename: Mariana
authors.initials: M
authors.lastname: Ramalho
authors.affiliation: ISPUP - EPI Unit, University of Porto, Rua das Taipas, nº135, 4050-600, Porto, Portugal; Department of Clinical Epidemiology, Predictive Medicine and Public Health, Faculty of Medicine, University of Porto, Al. Prof. Hernâni Monteiro, 4200-319, Porto, Portugal. Electronic address: nlunet@med.up.pt.
authors.forename: Nuno
authors.initials: N
authors.lastname: Lunet
mesh_terms: D001943:Breast Neoplasms; D060825:Cognitive Dysfunction; D006801:Humans; D013313:Stress Disorders, Post-Traumatic