Text and Data Mining valid from 2018-09-24
Received: 13 March 2018
Accepted: 10 September 2018
First Online: 24 September 2018
Compliance with ethical standards
: Informed consent was obtained from all individual participants included in the study.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: The authors have declared that no conflict of interest exists.