Observational studies

JF Peipert, MG Phipps - Clinical obstetrics and gynecology, 1998 - journals.lww.com
Although randomized controlled trials provide the highest level of evidence for causation,
many clinical issues cannot be addressed using experimental study design. Examples that …
被引用次数：42 相关文章

Observational studies.

JF Peipert, MG Phipps - Clinical Obstetrics and Gynecology, 1998 - europepmc.org
Observational studies are important methodologies to evaluate exposures and risk factors
that are not amenable to experimental trials. They offer the advantage of being more …

Observational studies

JF Peipert, MG Phipps - Clinical obstetrics and …, 1998 - pubmed.ncbi.nlm.nih.gov
Observational studies are important methodologies to evaluate exposures and risk factors
that are not amenable to experimental trials. They offer the advantage of being more …

[引用][C] OBSERVATIONAL STUDIES

JF PEIPERT, MG PHIPPS - Clinical obstetrics …, 1998 - Lippincott Williams & Wilkins