Funding for this research was provided by:
Alli Paasikiven Säätiö
National Institute for Health and Welfare
Article History
Accepted: 18 October 2020
First Online: 26 October 2020
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors. The study protocol has been approved by the Ethics Committee of the Finnish Institute for Health and Welfare in Helsinki, Finland (27.9.2012).
: Informed consent was obtained from all individual participants included in the study. Parents provided informed consents for the participation of their children.