Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Comment
. 2004;364(9436):755.
doi: 10.1016/S0140-6736(04)16926-2.

Observational versus randomised trial evidence

Debbie A Lawlor, George Davey Smith, K Richard Bruckdorfer, Devi Kundu, Shah Ebrahim
Comment

Observational versus randomised trial evidence

Debbie A Lawlor et al. Lancet. 2004.
No abstract available

PubMed Disclaimer

Comment on

MeSH terms

LinkOut - more resources