Funding for this research was provided by:
European Social Fund
Text and Data Mining valid from 2019-08-20
First Online: 20 August 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: Ethical approval for the study was received from Tallinn Medical Research Ethics Committee on June 2016. 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.
: Informed consent was obtained from all individual participants included in the study.