Affiliation: | 1. Penn Injury Science Center, University of Pennsylvania, 423 Guardian Dr. Blockley Hall, Rm. 937 Philadelphia, PA 19146, USA;2. Trauma Services, Dell Seton Medical Center at the University of Texas, 1500 Red River Street, Austin, TX 78701, USA;3. Seattle Children’s Hospital, Community Health & Benefit, Seattle, WA 98105, USA |