Text and Data Mining valid from 2019-10-01
Received: 28 August 2019
Accepted: 5 September 2019
First Online: 1 October 2019
Compliance with Ethical Standards
: The author declares that he has 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.