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Seasonal variation in the birth of left-handed schoolgirls
A. Leviton and T. Kilty
The birth of left-handed girls in a school population displayed a seasonal
trend, with a peak in November. No seasonal trend was seen in the birth of
left-handed boys. The seasonal pattern of birth of left-handed girls is
compatible with the hypothesis that nongenetic factors contribute to the
occurrence of left-handedness.
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