Wankerl, M
Miller, R http://orcid.org/0000-0002-8665-5248
Kirschbaum, C
Hennig, J
Stalder, T
Alexander, N
Article History
Received: 17 December 2013
Revised: 13 March 2014
Accepted: 16 April 2014
First Online: 17 June 2014
Competing interests
: The authors declare no conflict of interest.