title: Missing data.
authors.affiliation: Cancer Research UK/NHS Centre for Statistics in Medicine, Oxford OX2 6UD. doug.altman@cancer.org.uk
authors.forename: Douglas G
authors.initials: DG
authors.lastname: Altman
authors.forename: J Martin
authors.initials: JM
authors.lastname: Bland
mesh_terms: D015982:Bias; D003625:Data Collection / Q000592:standards*; D012107:Research Design / Q000592:standards*