Text and Data Mining valid from 2019-08-13
Received: 12 April 2019
Accepted: 2 August 2019
First Online: 13 August 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (local ethic committee - approval number 604-16) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.