Umbach, Roland http://orcid.org/0000-0001-9024-7450
Müller, Jochen-Klaus
Wendt-Nordahl, Gunnar
Knoll, Thomas
Jessen, Jan Peter
Article History
Received: 28 July 2018
Accepted: 3 January 2019
First Online: 16 January 2019
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: Our research did not involve human participants or animals.