Weight of backpacks school children carry or pull and whether they are too heavy and cause injury.
Thompson
Maria
M
D002140:California / Q000453:epidemiology; D002648:Child; D006293:Health Promotion; D006801:Humans; D017770:Lifting / Q000009:adverse effects*; D009140:Musculoskeletal Diseases / Q000453:epidemiology / Q000517:prevention & control*; D013334:Students / Q000706:statistics & numerical data