Text and Data Mining valid from 2019-02-28
Received: 18 November 2018
Accepted: 10 February 2019
First Online: 28 February 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.