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Observational studies and the difficult quest for causality: lessons from vaccine effectiveness and impact studies.

Author(s): Lipsitch M, Jha A, Simonsen L|Journal: Int J Epidemiol|PMID: 27453361| December 2016
Although randomized placebo-controlled trials (RCT) are critical to establish efficacy of vaccines at the time of licensure, important remaining questions…
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