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  • Seasonal modulation of reproductive effort during early pregnancy in humans 

    Vitzthum, Virginia J; Thornburg, Jonathan; Spielvogel, Hilde (American Journal of Human Biology, 2009-03-03)
    A B S T R A C T Life history theory predicts that early pregnancy presents a relatively low cost, uncontested opportunity for a woman to terminate investment in a current reproductive opportunity if a conceptus is of poor ...