Cosma, Alina http://orcid.org/0000-0002-0603-5226
Walsh, Sophie D.
Chester, Kayleigh L.
Callaghan, Mary
Molcho, Michal
Craig, Wendy
Pickett, William
Article History
Received: 27 February 2019
Revised: 30 May 2019
Accepted: 4 December 2019
First Online: 16 December 2019
Compliance with ethical standards
: Consent procedures required by ethical authorities for this type of survey were followed by each individual country. Institutional ethical consent was gained according to the requirements in each participating country, with schools, parents, and adolescents each providing informed consent or assent, either active or passive according to local requirements. Only those adolescents who volunteered to participate and whose parents did not object to their participation were included in the current study.
: The authors declare that they have no conflict of interests.
: Informed consent was obtained from all individual participants included in this study.