title: Bias in observational study designs: prospective cohort studies.
authors.affiliation: Institute for Medical and Biomedical Education, St George's, University of London, London, UK p.sedgwick@sgul.ac.uk.
authors.forename: Philip
authors.initials: P
authors.lastname: Sedgwick
mesh_terms: D000368:Aged; D015982:Bias; D005260:Female; D006801:Humans; D008875:Middle Aged; D064887:Observational Studies as Topic; D017698:Postmenopause; D011446:Prospective Studies; D012107:Research Design; D014481:United States / Q000453:epidemiology; D016387:Women's Health