Overview of study design in clinical epidemiology.
Stephenson
J M
JM
Department of Sexually Transmitted Diseases, UCL Medical School, Mortimer Market Centre, London. jstephenson@gum.ucl.ac.uk
Babiker
A
A
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