Funding for this research was provided by:
National Cancer Institute (R01CA214530)
Received: 14 August 2018
Accepted: 20 February 2019
First Online: 28 February 2019
Ethics approval and consent to participate
: Institutional review board approval from Washington University in St. Louis was not needed, as our work did not involve human subjects research. The NIS-Teen survey was originally approved by the Ethics Review Board of the National Center for Health Statistics, Centers for Disease Control and Prevention.
: Not applicable.
: The authors declare that they have no competing interests.
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