J Pediatr. 2012 Mar;160(3):508-10. doi: 10.1016/j.jpeds.2011.10.031. Epub 2011 Dec 3.
Department of Pediatrics, University of Tennessee Health Science Center, Le Bonheur Children's Hospital, Children's Foundation Research Center, Memphis, TN 38103, USA. rchesney at uthsc.edu
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