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Authors
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Funding
Funding for this research was provided by:
Estonian Research Competency Council (IUT34-8)
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Article History
Received: 18 October 2019
Accepted: 11 December 2019
First Online: 18 December 2019
Ethics approval and consent to participate
: Data processing was carried on anonymously under the licence of the Research Ethics Committee of the University of Tartu (protocol # 275/T-1, issued on 20.11.1017). The permission was granted to the authors to use any of the datasets collected by Prof Juhan Aul. The need for informed consent from participants had been waived due to the retrospective nature of the study.
: Not applicable.
: We declare we have no competing interests.
