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Saadat and Khalili1 cited evidence that men’s testosterone concentrations reportedly decline (temporarily) when they pay short visits to extreme altitudes.2 Moreover, these authors cited my hypothesis3 that the sex ratio (proportion male) of the offspring is partially dependent on parental hormones around the time of conception, low levels of testosterone (in either parent) being associated with the subsequent births of daughters. So these …
Competing interests None.
Provenance and Peer review Not commissioned; not externally peer reviewed.
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