title: Correspondence - Reply to THEBREAST-D-15-702.
authors.affiliation: Department of Epidemiology, University of Groningen, University Medical Center Groningen, PO Box 30.001, 9700RB Groningen, The Netherlands; Department of Primary Care and Public Health Sciences, Division of Health and Social Care Research, King's College London, Guy's, AH 3.2, SE1 1UL London, United Kingdom. Electronic address: r.koleva-kolarova@umcg.nl.
authors.forename: Rositsa G
authors.initials: RG
authors.lastname: Koleva-Kolarova
authors.affiliation: Department of Epidemiology, University of Groningen, University Medical Center Groningen, PO Box 30.001, 9700RB Groningen, The Netherlands. Electronic address: z.zhan01@umcg.nl.
authors.forename: Zhuozhao
authors.initials: Z
authors.lastname: Zhan
authors.affiliation: Department of Radiology, University of Groningen, University Medical Center Groningen, PO Box 30.001, 9700RB Groningen, The Netherlands. Electronic address: m.j.w.greuter@umcg.nl.
authors.forename: Marcel J W
authors.initials: MJ
authors.lastname: Greuter
authors.affiliation: Department of Epidemiology, University of Groningen, University Medical Center Groningen, PO Box 30.001, 9700RB Groningen, The Netherlands; National Institute for Public Health and the Environment (RIVM), Centre for Nutrition, Prevention and Health Services Research, PO Box 1, 3720BA Bilthoven, The Netherlands. Electronic address: t.l.feenstra@umcg.nl.
authors.forename: Talitha L
authors.initials: TL
authors.lastname: Feenstra
authors.affiliation: Department of Epidemiology, University of Groningen, University Medical Center Groningen, PO Box 30.001, 9700RB Groningen, The Netherlands. Electronic address: g.h.de.bock@umcg.nl.
authors.forename: Geertruida H
authors.initials: GH
authors.lastname: De Bock