Text and Data Mining valid from 2019-11-27
Received: 11 February 2019
Accepted: 15 November 2019
First Online: 27 November 2019
Compliance with ethical standards
: Disclosure of potential conflicts of interest: The authors declare that they have no conflict of interest.
: This manuscript complies with the Ethical Rules applicable for this journal, as stated in the Instructions of Authors.
: No funding was received.
: The research did not involve human participants and/or animals.
: Consent to submit has been received explicitly from all co-authors, as well as from the requisite authorities.