Iyer Sujit S, Haupt Alicia, Henretig Fred M
Division of Emergency Medicine, and Department of Pediatrics, The Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine, Philadelphia, PA, USA.
Pediatr Emerg Care. 2009 Mar;25(3):193-5. doi: 10.1097/PEC.0b013e31819f815d.