| Literature DB >> 19531116 |
C P Farrington1, M J Firth, L H Moulton, H Ravn, P K Andersen, S Evans.
Abstract
We review sources of bias which can affect non-randomized cohort studies of non-specific effects of vaccines on child mortality. Using examples from the literature on non-specific effects, we describe different sources of selection and information bias, and, where possible, outline analysis strategies to mitigate or eliminate such biases.Entities:
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Year: 2009 PMID: 19531116 DOI: 10.1111/j.1365-3156.2009.02302.x
Source DB: PubMed Journal: Trop Med Int Health ISSN: 1360-2276 Impact factor: 2.622