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    • Epidemiological research methods. Part IV. Case-control studies 

      Yach, D.; Botha, J. L. (Health and Medical Publishing Group (HMPG), 1987-06)
      Randomised controlled trials (RCTs), although regarded as the best method for assessing the efficacy of an intervention, have several shoncomings and may be impossible to conduct, for example in the case of harmful risk ...