title: Authors' Response.
authors.affiliation: Pediatric Emergency Medicine Attending, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania shaw@email.chop.edu.
authors.forename: Kathy N
authors.initials: KN
authors.lastname: Shaw
authors.affiliation: Pediatric Emergency Medicine Attending, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.
authors.forename: Mercedes M
authors.initials: MM
authors.lastname: Blackstone
authors.affiliation: Pediatric Emergency Medicine Attending, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.
authors.forename: Jane M
authors.initials: JM
authors.lastname: Lavelle