Text and Data Mining valid from 2020-02-13
Received: 4 November 2019
Accepted: 7 February 2020
First Online: 13 February 2020
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 research committee (J180) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.