Text and Data Mining valid from 2019-12-02
Received: 20 November 2019
Accepted: 21 November 2019
First Online: 2 December 2019
Compliance with Ethical Standards
: The author has no financial interest to declare in relation to the content of this communication.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: For this type of study, informed consent is not required.