Wirth, R
Smoliner, C
Spamer, C
Marburger, C
Schreiber, F S
Willschrei, H P
Lenzen-Großimlinghaus, R
Schäfer, R
Volkert, D
Article History
Received: 11 February 2014
Revised: 21 March 2014
Accepted: 10 April 2014
First Online: 21 May 2014
Competing interests
: The authors declare no conflict of interest.