Pannicke, T
Frommherz, I
Biedermann, B
Wagner, L
Sauer, K
Ulbricht, E
Härtig, W
Krügel, U
Ueberham, U
Arendt, T
Illes, P
Bringmann, A
Reichenbach, A
Grosche, A
Article History
Received: 6 May 2014
Revised: 2 June 2014
Accepted: 4 June 2014
First Online: 31 July 2014
Competing interests
: The authors declare no conflict of interest.