Funding for this research was provided by:
Professor Miklós Maróth (GF/JSZF/814/9/2015)
Text and Data Mining valid from 2017-04-13
Received: 23 January 2017
Accepted: 9 April 2017
First Online: 13 April 2017
Compliance with ethical standards
: The authors declare no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.