Text and Data Mining valid from 2019-11-01
Received: 24 June 2019
Revised: 9 July 2019
Accepted: 25 July 2019
First Online: 16 January 2020
COMPLIANCE WITH ETHICAL STANDARDS
: This article does not contain any studies with the use of humans and animals as objects of research.
: The authors state that there is no conflict of interests.