Spiegler, J
Eisemann, N
Ehlers, S
Orlikowsky, T
Kannt, O
Herting, E
Göpel, W
,
Article History
Received: 5 February 2014
Revised: 19 February 2015
Accepted: 9 March 2015
First Online: 15 April 2015
Competing interests
: The authors declare no conflict of interest.