Observational measures of children's physical activity.
Dept. of Physical Education, San Diego State University, CA 92182.
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McKenzie
D002648:Child; D002675:Child, Preschool; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008991:Monitoring, Physiologic / Q000295:instrumentation