Confounding in epidemiologic studies: the adequacy of the control group as a measure of confounding.
Wickramaratne P, Holford T. Confounding in epidemiologic studies: the adequacy of the control group as a measure of confounding. Biometrics 1987, 43: 751-65. PMID: 3427162, DOI: 10.2307/2531530.Peer-Reviewed Original Research