Funding for this research was provided by:
Nemzeti Kutatási Fejlesztési és Innovációs Hivatal (NVKP_16-1-2016-0037, KH-129581, 2018-1.3.1-VKE-2018-00032)
Text and Data Mining valid from 2019-03-15
Received: 30 November 2018
Accepted: 26 February 2019
First Online: 15 March 2019
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