title: Re: "Toward a clearer definition of confounding".
authors.forename: M M
authors.initials: MM
authors.lastname: Joffe
mesh_terms: D015986:Confounding Factors, Epidemiologic; D015987:Effect Modifier, Epidemiologic; D004812:Epidemiologic Methods; D006801:Humans; D007246:Infertility / Q000453:epidemiology; D008137:Longitudinal Studies