Beygo, Jasmin
Joksic, Ivana
Strom, Tim M
Lüdecke, Hermann-Josef
Kolarova, Julia
Siebert, Reiner
Mikovic, Zeljko
Horsthemke, Bernhard
Buiting, Karin
Article History
Received: 17 September 2015
Revised: 15 December 2015
Accepted: 22 December 2015
First Online: 3 February 2016
Competing interests
: The authors declare no conflict of interest.