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Authors
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Funding
Funding for this research was provided by:
Emil Aaltosen Säätiö
The Latvian Council of Science (lzp-2018/1-0393)
Estonian Ministry of Education and Science (PUT1223)
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Article History
Received: 7 March 2019
Accepted: 16 March 2019
First Online: 22 May 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The material contained in this article is a review of previously published or presented data. This article does not contain any studies with human participants or animals performed by the authors.
