Results 251 to 260 of about 450,753 (263)
Some of the next articles are maybe not open access.
Improving observational studies in the era of big data
Lancet, The, 2018Jennifer Gill, Vinay Prasad
exaly
Randomized, Controlled Trials, Observational Studies, and the Hierarchy of Research Designs
New England Journal of Medicine, 2000John Concato
exaly
When are observational studies as credible as randomised trials?
Lancet, The, 2004Jan P Vandenbroucke
exaly
The HRT controversy: observational studies and RCTs fall in line
Lancet, The, 2009Jan P Vandenbroucke
exaly

