title: Commentary: does the spectre of ecologic bias haunt epidemiology?
authors.affiliation: Department of Environmental Health (T2E), Boston University School of Public Health, 715 Albany St, Boston, MA 02118-2526, USA. twebster@bu.edu
authors.forename: Thomas
authors.initials: T
authors.lastname: Webster
mesh_terms: D015982:Bias; D016022:Case-Control Studies; D006801:Humans; D016273:Occupational Exposure