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    J Palliat Med. 2009 Feb;12(2):181-7.

    The challenge of selection bias and confounding in palliative care research.

    Source

    Department of Bioethics and Humanities, School of Medicine, University of Washington, Seattle, WA 98195-7120, USA. tigiba@u.washington.edu

    PMID:
    19207063
    [PubMed - indexed for MEDLINE]
    PMCID:
    PMC2982715
    Free PMC Article

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