Vogt, S
Zierer, A
Laxy, M
Koenig, W
Linkohr, B
Linseisen, J
Peters, A
Thorand, B
Article History
Received: 5 November 2014
Revised: 14 April 2015
Accepted: 29 April 2015
First Online: 22 July 2015
Competing interests
: The authors declare no conflict of interest.