Received: 14 August 2018
Accepted: 20 August 2019
First Online: 6 September 2019
Ethics approval and consent to participate
: The protocol of the investigation was approved by the Institutional Review Board (Human Investigation Review Board, University of Szeged, Albert Szent-Györgyi Clinical Center. Reference number: 38/2014), and the investigators obtained written informed consent from each participant or each participant’s guardian. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: not applicable.
: The authors declare that they have no competing interests.