Re: "Toward a clearer definition of confounding".
Sheehe
P R
PR
D000022:Abortion, Spontaneous / Q000453:epidemiology*; D015982:Bias; D015984:Causality; D015986:Confounding Factors, Epidemiologic; D004781:Environmental Exposure; D005260:Female; D006801:Humans; D011247:Pregnancy