Text and Data Mining valid from 2019-11-13
Received: 3 September 2019
Accepted: 31 October 2019
First Online: 13 November 2019
Compliance with ethical standards
: The authors declare that they have no conflicts of interest to disclose.
: 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.