Text and Data Mining valid from 2019-07-05
Received: 19 June 2019
Accepted: 20 June 2019
First Online: 5 July 2019
Compliance with ethical standards
: I do not have any interests to disclose.
: This article did not require ethical approval of any kind.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: For this type of study formal consent is not required.