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Greenland S, Morgenstern H. Ecological bias, confounding, and effect modification. Int J Epidemiol. 1989;18(1):269-74doi: 10.1093/ije/18.1.269.
Greenland, S., & Morgenstern, H. (1989). Ecological bias, confounding, and effect modification. International journal of epidemiology, 18(1), 269-74. https://doi.org/10.1093/ije/18.1.269
Greenland, S, and Morgenstern, H. "Ecological bias, confounding, and effect modification." International journal of epidemiology vol. 18,1 (1989): 269-74. doi: https://doi.org/10.1093/ije/18.1.269
Greenland S, Morgenstern H. Ecological bias, confounding, and effect modification. Int J Epidemiol. 1989 Mar;18(1):269-74. doi: 10.1093/ije/18.1.269. PMID: 2656561.
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