Inj Prev. 2002 Mar;8(1):6-7.
Statistical and design issues in studies of groups.
Cummings P, Koepsell TD.
Harborview Injury Prevention and Research Center and the Department of Epidemiology, University of Washington, Seattle 98104-2499, USA. peterc@u.washington.edu
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PMID: 11928977 [PubMed - indexed for MEDLINE]
PMCID: 1730834
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