Funding for this research was provided by:
Sosiaali- ja Terveysministeriö (NA)
Juho Vainion Säätiö (NA)
Yrjö Jahnssonin Säätiö (6988)
Received: 9 October 2019
Accepted: 18 December 2019
First Online: 27 December 2019
Ethics approval and consent to participate
: The research plans were approved by the Institutional Review Board of the National Institute for Health and Welfare (THL), Finland (THL/1370/6.02.01/2016). Participation in the survey was voluntary, and parents could refuse the use of their children’s information in the survey.
: Not applicable.
: The authors declare that they have no competing interests.