Text and Data Mining valid from 2019-01-07
Received: 11 October 2018
Revised: 20 November 2018
Accepted: 23 November 2018
First Online: 7 January 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with animals performed by any of the authors.
: Informed consent was obtained from all individual participants included in the study.