Schoolchildren and backpacks.
Iyer
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SR
D000293:Adolescent; D000886:Anthropometry; D001416:Back Pain / Q000453:epidemiology / Q000209:etiology*; D002648:Child; D003625:Data Collection; D005260:Female; D006801:Humans; D017770:Lifting / Q000009:adverse effects*; D008297:Male; D010147:Pain Measurement; D012737:Sex Factors; D013334:Students / Q000706:statistics & numerical data*; D011795:Surveys and Questionnaires; D014481:United States / Q000453:epidemiology