Funding for this research was provided by:
the Kempe-Karlgrenska foundation (-)
Text and Data Mining valid from 2019-06-24
Received: 10 July 2018
Accepted: 12 June 2019
First Online: 24 June 2019
Ethics approval and consent to participate
: Ethical permissions for the project, and its continuation until the pupils left senior high, was given by the Ethical Committees of Linköping’s University and the Karolinska Institutet, Dnr: 99-141, and by the Regional Ethical Review Board in Stockholm, 2013/1062-32.All families, parents and children were informed about the study and gave written consent to participate. Those not giving consent did not participate.
: Not applicable.
: No competing interests to report.