Results 331 to 334 of about 51,352,550 (334)
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Observational studies

1986
openaire   +1 more source

Decline in the AIDS and death rates in the EuroSIDA study: an observational study

Lancet, The, 2003
exaly  

Bias and causal associations in observational research

Lancet, The, 2002
exaly  

Observational Studies

2012
openaire   +1 more source
humans
3. good health
environmental science
prospective studies
cohort studies
psychology
computer science
retrospective studies
observational studies as topic
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