title: Overview of study design in clinical epidemiology.
authors.affiliation: Department of Sexually Transmitted Diseases, UCL Medical School, Mortimer Market Centre, London. jstephenson@gum.ucl.ac.uk
authors.forename: J M
authors.initials: JM
authors.lastname: Stephenson
authors.forename: A
authors.initials: A
authors.lastname: Babiker
mesh_terms: D016022:Case-Control Studies; D015984:Causality; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D016021:Epidemiologic Studies; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D012107:Research Design