Silverman Gary A, Pak Stephen C, Perlmutter David H
Department of Pediatrics, University of Pittsburgh School of Medicine, Children's Hospital of Pittsburgh and Magee Women's Hospital of University of Pittsburgh Medical Center, Pittsburgh, PA 15224, USA.
J Pediatr. 2013 Aug;163(2):320-6. doi: 10.1016/j.jpeds.2013.03.077. Epub 2013 May 8.