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Article History

Received: 20 May 2018

Accepted: 6 April 2019

First Online: 11 April 2019

Compliance with ethical standards

:

: The author Lőrincz, J. declares that she has no conflict of interest. The author Molnár, Sz. declares that he has no conflict of interest. The author Jakab, A. declares that he has no conflict of interest. The author Török, P. declares that he has no conflict of interest. The author Herman, T. declares that she has no conflict of interest. The author Singh Jashanjeet declares that he has no conflict of interest.

: This article is a retrospective study. Retrospective research was conducted on already available data. Before the first submission, no ethical approval was required by the regulations of the host institutions. However, all the procedures 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.

: This article does not contain any studies with animals performed by any of the authors.

: Informed consent was obtained from all individual participants included in the study.