U.S. children's health declining.
D000163:Acquired Immunodeficiency Syndrome / Q000401:mortality*; D002423:Cause of Death; D002648:Child; D002675:Child, Preschool; D005260:Female; D006708:Homicide / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D010809:Physical Fitness; D014481:United States / Q000453:epidemiology