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    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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