Funding for this research was provided by:
University Medical Center Groningen
Article History
First Online: 27 November 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: All procedures were approved by the Dutch Central Committee on Research Involving Human Subjects, therefore complying with the ethical standards of the 1964 Helsinki declaration and its later amendments.
: The participants of the study provided written consent at the second through sixth assessment waves. A parent provided written parental consent for adolescent participation during the first three assessment waves, and written consent to participate at every assessment wave.