When are observational studies as credible as randomised trials?

Lancet. 2004 May 22;363(9422):1728-31. doi: 10.1016/S0140-6736(04)16261-2.
No abstract available

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bias
  • Confounding Factors, Epidemiologic
  • Drug-Related Side Effects and Adverse Reactions
  • Humans
  • Observation*
  • Random Allocation
  • Randomized Controlled Trials as Topic*
  • Research Design
  • Risk