Funding for this research was provided by:
Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja (172031)
Text and Data Mining valid from 2019-04-11
Received: 14 December 2018
Accepted: 4 April 2019
First Online: 11 April 2019
Compliance with ethical standards
: On behalf of all authors, the corresponding author states that there is no conflict of interest.