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Ecological bias, confounding, and effect modification.
Greenland S, Morgenstern H. Greenland S, et al. Among authors: morgenstern h. Int J Epidemiol. 1989 Mar;18(1):269-74. doi: 10.1093/ije/18.1.269. Int J Epidemiol. 1989. PMID: 2656561 Review.
Confounding in health research.
Greenland S, Morgenstern H. Greenland S, et al. Among authors: morgenstern h. Annu Rev Public Health. 2001;22:189-212. doi: 10.1146/annurev.publhealth.22.1.189. Annu Rev Public Health. 2001. PMID: 11274518 Review.
Selection bias in epidemiologic studies.
Kleinbaum DG, Morgenstern H, Kupper LL. Kleinbaum DG, et al. Among authors: morgenstern h. Am J Epidemiol. 1981 Apr;113(4):452-63. doi: 10.1093/oxfordjournals.aje.a113113. Am J Epidemiol. 1981. PMID: 6971055
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