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pro vyhledávání: '"Yuejen Zhao"'
Publikováno v:
BioMed Research International. 2014, Vol. 2014, p1-8. 8p.
Publikováno v:
BioMed Research International. 2014, Vol. 2014, p1-6. 6p.
Publikováno v:
BioMed Research International, Vol 2014 (2014)
BioMed Research International
BioMed Research International
Background. Observational studies are commonly conducted in health research. However, due to their lack of randomization, the estimated associations between the outcome and the exposure can be affected by unmeasured confounding factors. It is importa