Schargus, M
Kusserow, C
Schlötzer-Schrehardt, U
Hofmann-Rummelt, C
Schlunck, G
Geerling, G
Article History
Received: 16 December 2013
Accepted: 1 August 2014
First Online: 3 October 2014
Competing interests
: The authors declare no conflict of interest.