Document is current

Article History

Received: 28 November 2019

Accepted: 21 February 2020

First Online: 12 March 2020

Compliance with Ethical Standards

:

: The authors declare that they have no conflict of interest.

: All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional and/or notional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Following the requirements for ethical conduct in survey-based research with human subjects in Switzerland, outlined by the Association of the Swiss Ethics Committee (2009) and later in the Swiss Human Research Act introduced in 2014, informed consent was obtained at the beginning of the study (wave one) and at wave 4 (age 11) from the parents and again from the children at age 13 onwards. In wave five and six (age 13, and 15 respectively), parents were given the opportunity to refuse their child’s participation in the study (passive consent).

: Informed consent was obtained from all individual participants included in the study.