Text and Data Mining valid from 2018-09-26
Received: 3 July 2018
Accepted: 15 September 2018
First Online: 26 September 2018
Compliance with ethical standards
: There is no conflict of interest associated with this article.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Informed consent is not required because no human participants were involved in this article.