Funding for this research was provided by:
Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja (TR 31017)
Text and Data Mining valid from 2019-04-04
Received: 3 November 2018
Accepted: 18 March 2019
First Online: 4 April 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.