Int J Epidemiol. 2002 Feb;31(1):161-2.
Commentary: does the spectre of ecologic bias haunt epidemiology?
Webster T.
Department of Environmental Health (T2E), Boston University School of Public Health, 715 Albany St, Boston, MA 02118-2526, USA. twebster@bu.edu
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PMID: 11914313 [PubMed - indexed for MEDLINE]
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