title: Size does matter.
authors.affiliation: Department of Public Health, University of Aberdeen, Foresterhill, Aberdeen, UK. j.mollison@abdn.ac.uk
authors.forename: Jill
authors.initials: J
authors.lastname: Mollison
authors.forename: Julie A
authors.initials: JA
authors.lastname: Simpson
authors.forename: Philip C
authors.initials: PC
authors.lastname: Hannaford
mesh_terms: D035843:Biomedical Research; D002986:Clinical Trials as Topic; D003627:Data Interpretation, Statistical; D016021:Epidemiologic Studies; D005193:Family Planning Services; D006801:Humans; D008137:Longitudinal Studies; D018456:Reproductive Medicine; D018401:Sample Size; D015983:Selection Bias; D016896:Treatment Outcome; D006113:United Kingdom