Text and Data Mining valid from 2019-08-16
Received: 30 July 2019
Accepted: 2 August 2019
First Online: 16 August 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict 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.