Text and Data Mining valid from 2019-09-14
Received: 26 October 2018
Accepted: 3 September 2019
First Online: 14 September 2019
Compliance with ethical standards
: This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. The authors 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.