title: Study size.
authors.affiliation: Department of Paediatric Epidemiology and Biostatistics, Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK. awade@ich.ucl.ac.uk
authors.forename: A
authors.initials: A
authors.lastname: Wade
mesh_terms: D000465:Algorithms; D005260:Female; D006363:Hebrides / Q000453:epidemiology; D006801:Humans; D011247:Pregnancy; D015995:Prevalence; D018401:Sample Size; D012749:Sexually Transmitted Diseases / Q000453:epidemiology*