title: Ecological studies: advantages and disadvantages.
authors.affiliation: Centre for Medical and Healthcare Education, St George's, University of London, London, UK p.sedgwick@sgul.ac.uk.
authors.forename: Philip
authors.initials: P
authors.lastname: Sedgwick
mesh_terms: D002648:Child; D002669:Child Welfare; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D003625:Data Collection; D055669:Ecological and Environmental Phenomena; D004779:Environment Design; D005260:Female; D014943:Global Health; D006801:Humans; D008297:Male; D011203:Poverty; D012107:Research Design; D012959:Socioeconomic Factors