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Journal Article INTERACTION IN EPIDEMIOLOGIC STUDIES Get access LAWRENCE L. KUPPER, LAWRENCE L. KUPPER 1Department of Biostatistics, School of Public Health, University of North CarolinaChapel Hill, NC 27514 1Reprint requests to Dr. Kupper. Search for other works by this author on: Oxford Academic PubMed Google Scholar MICHAEL D. HOGAN MICHAEL D. HOGAN 2Biometry Branch, National Institute of Environmental Health SciencesChapel Hill, NC 27514 Search for other works by this author on: Oxford Academic PubMed Google Scholar American Journal of Epidemiology, Volume 108, Issue 6, December 1978, Pages 447–453, https://doi.org/10.1093/oxfordjournals.aje.a112643 Published: 01 December 1978
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Kupper et al. (1978) studied this question.
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