Text and Data Mining valid from 2018-09-15
Received: 8 June 2018
Accepted: 5 September 2018
First Online: 15 September 2018
Compliance with ethical standards
: The authors declare that there is no conflict of interest.
: 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.