[A fundamental biologic rhythm].
Zumaglini
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D000293:Adolescent; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D002940:Circadian Rhythm / Q000502:physiology*; D006801:Humans; D007231:Infant, Newborn; D012890:Sleep / Q000502:physiology*; D013997:Time Factors