Funding for this research was provided by:
National Research, Development and Innovation Office (NKFIH) of Hungary (NVKP_16-1-2016-0017)
Text and Data Mining valid from 2019-04-29
Received: 18 December 2018
Accepted: 23 March 2019
First Online: 29 April 2019
Compliance with ethical standards
: We have no potential conflict of interest.