Text and Data Mining valid from 2019-09-05
Received: 24 June 2019
Accepted: 19 August 2019
First Online: 5 September 2019
Compliance with ethical standards
: All authors declare having no conflicts of interests or financial disclosures.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: The study does not require an informed consent as no participants were recruited.