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International Journal of Epidemiology, Volume 33, Number 1, pp. 226
IJE vol.33 no.1 © International Epidemiological Association 2004; all rights reserved.

Letter to the Editor

Do gonadal hormones confound between parental smoking and offspring sex ratio?

William H. James

The Galton Laboratory, University College London, Wolfson House, 4 Stephenson Way, London NW1 2HE, UK

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Sirs—Obel et al.1 report that their data fail to confirm the suggestion of Fukuda et al.2 that periconceptional smoking of either parent tends to lower the associated offspring sex ratio (proportion male). There are at least a dozen . . . [Full Text of this Article]


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