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Opel DJ, Lundin DA, Stevenson KL, Klein EJ.Opel DJ, et al. Among authors: lundin da.Pediatr Emerg Care. 2004 Jul;20(7):468-72. doi: 10.1097/01.pec.0000136894.91647.6f.Pediatr Emerg Care. 2004.PMID: 15232251