Text and Data Mining valid from 2019-09-01
Received: 14 October 2018
Accepted: 10 September 2019
First Online: 20 November 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 and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all participants in the study.