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Article History

Received: 29 May 2018

Accepted: 23 January 2019

First Online: 31 January 2019

Ethics approval and consent to participate

: Ethical approval was obtained from the ethics committee of the René Rachou Institute, under the CAAE protocol 57,950,816.0.0000.5091, and adolescents and their parents/legal guardians, as well as school staff, gave their written consent to participate in the study as a whole, including interviews. Information about the study, potential harms and benefits, the purpose of the study and the right of withdrawal were emphasized, both in the written material and directly before the interviews began. The anonymity and confidentiality of audio recordings and transcripts were ensured through subject-identifiable codes instead of names.

: Not applicable

: The authors declare that they have no competing interests.

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