Funding for this research was provided by:
Pediatric Emergency Medicine Research Foundation, Long Beach, CA
Text and Data Mining valid from 2018-11-22
Received: 4 December 2017
Accepted: 29 October 2018
First Online: 22 November 2018
Ethics approval and consent to participate
: The State of California Committee for Protection of Human Subjects and the State of California and Department of Health Care Services approved this study and waived the requirement for informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.