A N Phillips, G D Smith. Show Affiliations »
Abstract
Mesh: See more » BiasConfounding Factors, EpidemiologicEpidemiologic MethodsRisk Factors
Year: 1992 PMID: 1350831 DOI: 10.1016/0140-6736(92)91242-z
Source DB: PubMed Journal: Lancet ISSN: 0140-6736 Impact factor: 79.321