Text and Data Mining valid from 2019-08-14
Accepted: 1 August 2019
First Online: 14 August 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest and certify that this work was carried out in a public research organization and that no potential source of conflict of interest exists with any other public or private research organization. This article does not contain any studies with human participants or animals performed by any of the authors.