Schmidt, Jurema
Klingler, Franca-Maria
Proschak, Ewgenji
Steinhilber, Dieter
Schubert-Zsilavecz, Manfred
Merk, Daniel
Article History
Received: 23 June 2015
Accepted: 10 September 2015
First Online: 1 October 2015
Competing interests
: The authors declare no competing financial interests.