Text and Data Mining valid from 2020-01-06
Received: 1 October 2019
Accepted: 19 December 2019
First Online: 6 January 2020
Ethics approval and consent to participate
: Not applicable. Samples were collected with the permission of the Ministry of Environment of the Republic of Lithuania (2013-03-26 no.14; 2014-03-03 no.15; 2017-03-23 no.26-A4-3119; 2019-03-01 no. 26-A4-1535).
: Not applicable.
: The authors declare that they have no competing interests.