TY  - RPRT
TI  - Observational versus randomised trial evidence.
AU  - Debbie A Lawlor
AU  - George Davey Smith
AU  - K Richard Bruckdorfer
AU  - Devi Kundu
AU  - Shah Ebrahim
DO  - 10.1016/s0140-6736(04)16926-2
UR  - https://pubmed.ncbi.nlm.nih.gov/15337394/
ID  - 15337394
ER  -