Editorial: Toxic mail.
D000056:Accident Prevention; D002648:Child; D002675:Child, Preschool; D004349:Drug Packaging / Q000592:standards; D006801:Humans; D007223:Infant; D008297:Male; D011041:Poisoning / Q000517:prevention & control*; D011177:Postal Service; D014481:United States; D014486:United States Food and Drug Administration