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ExperimentalObservational: Analytic 

Clinical trials

  • Parallel randomised
  • Parallel non-randomised
  • Cross-over

Community trials

Historical controlled trials

Prospective cohort Cohort study

  • ConcurrentProspective
  • Non-concurrentRetrospective

Case-control

Cross-sectional

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Field trial: subjects without disease are placed in different preventative intervention groups.   

References