title: Response to commentary by Alaa El-Ghoneimi.
authors.affiliation: The Children's Hospital of Philadelphia, Philadelphia, PA, USA. Electronic address: longc3@email.chop.edu.
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Long
authors.affiliation: The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
authors.forename: Douglas A
authors.initials: DA
authors.lastname: Canning