E A Engels1, M R Spitz. Show Affiliations » 1. Division of Clinical Care Research, New England Medical Center, Tufts University School of Medicine, Boston, Massachusetts, USA.
Abstract
Mesh： See more » Case-Control StudiesCohort StudiesEpidemiologic MethodsHumansMulticenter Studies as Topic/methodsRandomized Controlled Trials as Topic/methodsRegistriesResearch Design
Year: 1997 PMID： 9291897 DOI： 10.1016/S0140-6736(05)63506-4
Source DB: PubMed Journal: Lancet ISSN： 0140-6736 Impact factor: 79.321