title: Authors' response to Hartwig and Davies.
authors.affiliation: University of Queensland Diamantina Institute, Translational Research Institute, Brisbane, QLD, Australia.|MRC Integrative Epidemiology Unit and.
authors.forename: From John P
authors.initials: FJ
authors.lastname: Kemp
authors.affiliation: School of Clinical Sciences, University of Bristol, Bristol, UK.
authors.forename: Adrian
authors.initials: A
authors.lastname: Sayers
authors.affiliation: MRC Integrative Epidemiology Unit and.
authors.forename: George
authors.initials: G
authors.lastname: Davey Smith
authors.affiliation: School of Clinical Sciences, University of Bristol, Bristol, UK.
authors.forename: Jonathan H
authors.initials: JH
authors.lastname: Tobias
authors.affiliation: University of Queensland Diamantina Institute, Translational Research Institute, Brisbane, QLD, Australia Dave.Evans@bristol.ac.uk.|MRC Integrative Epidemiology Unit and.
authors.forename: David M
authors.initials: DM
authors.lastname: Evans