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Subjects: PHYSICAL activity; ANALYSIS of variance; STATISTICAL correlationUNITED States
Subjects: SLEEP; ATTENTION-deficit hyperactivity disorder; CLINICAL trials
Subjects: MIDDLE-income countries; RISK assessment; ENVIRONMENTAL health
Subjects: BIOLOGICAL models; LIQUID chromatography-mass spectrometry; RESEARCH funding
Subjects: AFFINITY groups; SCHOOL environment; AGE distributionUNITED States