Text and Data Mining valid from 2019-07-29
Received: 14 November 2018
Accepted: 3 July 2019
First Online: 29 July 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008 (5).
: This article does not contain any studies with human or animal subjects performed by any of the authors.