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Authors
Nakazawa-Miklasevica, M.
Daneberga, Z.
Murmane, D.
Kroica, J.
Cupane, L.
Isarova, D.
Berga-Svitina, E.
Masinska, M.
Miklasevics, E.
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Article History
Received: 6 February 2021
Revised: 11 March 2021
Accepted: 4 May 2021
First Online: 21 February 2022
COMPLIANCE WITH ETHICAL STANDARDS
: <i>Conflict of interests</i>. The authors declare that they have no conflicts of interest.
: <i>Statement on the welfare of humans</i>. Central Medical Ethics Committee at the Ministry of Health, Republic of Latvia approved the study (no. 1/19-02-12 from February 12th, 2019). Parents of all involved subjects signed informed consent form and filled-in questionaries before collecting samples. The study was performed in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments.
