Text and Data Mining valid from 2020-02-13
Received: 25 December 2019
Accepted: 3 February 2020
First Online: 13 February 2020
Compliance with ethical standards
: The authors have no conflict of interest to declare regarding the materials or methods used in this study or the findings presented in this paper.
: All procedures performed in the 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.
: Informed consent was obtained from all involved participants included in the study.