Text and Data Mining valid from 2019-10-12
Received: 18 July 2018
Accepted: 30 September 2019
First Online: 12 October 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: 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 individual participants included in this study.