Hess, Florian
Zettl, Ralph
Smolen, Daniel
Knoth, Christoph
Article History
Received: 4 December 2017
Accepted: 20 March 2018
First Online: 23 March 2018
Compliance with ethical standards
:
: Florian Hess, Ralph Zettl, Daniel Smolen and Christoph Knoth declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Informed consent was obtained from all individual participants included in the study.