Funding for this research was provided by:
GINOP (2.3.2-15-2016-00015, 2.3.2-15-2016-00011)
National Research, Development and Innovation Fund of Hungary (NKFI-6-K funding scheme, 11493 project)
Magyar Tudományos Akadémia (János Bolyai Research Scholarship)
Received: 8 June 2018
Accepted: 19 July 2018
First Online: 27 July 2018
Compliance with Ethical Standards
: No potential conflict of interest was reported by the authors.
: The study protocol conformed to the Declaration of Helsinki in all respects and was approved by the Institutional Ethics Committee of the University of Szeged (No. 3161).