Received: 4 November 2020
Accepted: 16 April 2021
First Online: 3 May 2021
: Adolescents 12–17 years provided assent and informed consent was obtained from their parents. Adolescents 18–19 years provided informed consent and did not require parental consent. All of the data collection processes were approved by the National Center for Health Statistics Research Ethics Review Board (protocol #2005–06 and protocol #2011–17). All research methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.