Vogel, S
Börger, V
Peters, C
Förster, M
Liebfried, P
Metzger, K
Meisel, R http://orcid.org/0000-0001-5230-0628
Däubener, W
Trapp, T
Fischer, J C
Gawaz, M
Sorg, R V
Article History
Received: 26 March 2014
Revised: 22 November 2014
Accepted: 24 November 2014
First Online: 9 January 2015
Competing interests
: The authors declare no conflict of interest.