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Walk the evidence base by book and chapter — the raw source passages that ground Ask, Differential, and the rest.
1 passage
The power of meta-analysis to address an important clinical question in obstetrics. After 17 years of collaborative research, a meta-analysis of randomized controlled trials on cerclage for singleton gestations with a prior spontaneous preterm birth and with a short transvaginal ultrasound cervical length <25mm before 24 weeks led to new clinical recommendations worldwide. This is an example of the power of meta-analyses, of why I like them, and why I think you should like them too. Many societies rank meta-analyses of randomized controlled trials as the best level of evidence, even above that of a single randomized controlled trial.