Knebel, Thomas
Braun, Peter
Dietrich, Helmut
Funding for this research was provided by:
German Ministery of Education and Research (Project FHprofUnd, reference number 1737X09)
Article History
Received: 5 January 2018
Revised: 21 April 2018
Accepted: 27 April 2018
First Online: 16 May 2018
Compliance with ethical standards
:
: Authors declare that they have no competing interests.
: This article does not contain any studies with human or animal subjects.