Funding for this research was provided by:
Vedecká Grantová Agentúra MŠVVaŠ SR a SAV (1/0269/16)
Bulgarian National Science Fund (KP-06-H26/4)
Javna Agencija za Raziskovalno Dejavnost RS (P4-0059)
Article History
Received: 16 August 2019
Accepted: 10 January 2020
First Online: 30 January 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.