Article History
Received: 26 November 2018
Accepted: 9 January 2019
First Online: 28 January 2019
Compliance with ethical guidelines
:
: L. Biener, C. Pizarro, G. Nickenig, and D. Skowasch declare that they have no competing interests.
: This article does not contain any studies with human participants or animals performed by any of the authors.