Epidemiol Rev. 2004;26:104-11.
The study of group-level factors in epidemiology: rethinking variables, study designs, and analytical approaches.
Diez Roux AV.
Department of Epidemiology, University of Michigan School of Public Health, Ann Arbor, MI 48101-2548, USA. adiezrou@umich.edu
PMID: 15234951 [PubMed - indexed for MEDLINE]
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