Article History
Received: 2 November 2019
Revised: 1 February 2020
Accepted: 9 February 2020
First Online: 2 March 2020
Competing interests
: The authors declare no competing interests.
: Parents/guardians gave written consent for their adolescent child to participate in the study, and adolescents provided written assent.
: ClinicalTrials.gov Identifier NCT01503333.