Funding for this research was provided by:
National Center for Injury Prevention and Control (U81/CCU417778; R01 CE001397; R49 CE000562)
Article History
Received: 17 September 2016
Accepted: 5 January 2017
First Online: 16 January 2017
Compliance with Ethical Standards
:
: The authors declare that they have no competing interests.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.