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  • Title: Circannual changes in ventricular function assessed by echocardiography.
    Author: Saito Y, Tamura K, Hillman DC, Cornélissen G, Halberg F.
    Journal: Chronobiologia; 1992; 19(1-2):59-65. PubMed ID: 1628522.
    Abstract:
    Cardiac function may vary predictably along the 1-year scale. A circannual rhythm, more or less in phase is documented for 5 echocardiographic variables in clinically healthy Japanese adults.
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