[Periodic heart frequency variations in premature children].
D002320:Cardiovascular Physiological Phenomena; D002648:Child; D006321:Heart; D006339:Heart Rate; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007234:Infant, Premature / Q000502:physiology*; D011674:Pulse
INFANT, PREMATURE/physiology; PULSE/in infancy and childhood