title: Confounding.
authors.affiliation: University of Windsor, in Windsor, Ont, Canada.
authors.forename: Maher M
authors.initials: MM
authors.lastname: El-Masri
mesh_terms: D015986:Confounding Factors, Epidemiologic; D003625:Data Collection / Q000379:methods*; D006302:Health Services Research / Q000379:methods*; D006801:Humans; D015203:Reproducibility of Results; D012107:Research Design