Funding for this research was provided by:
Health Research Council of New Zealand (11/645)
Text and Data Mining valid from 2018-06-19
First Online: 19 June 2018
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: Ethical approval for this study was granted by the New Zealand National Health and Disability Ethics Committee (12/NTB/35).
: Schools and parents of all participating adolescents were fully informed about the study and subsequently provided written consent; while all children provided verbal assent to participate.