Lisak, D
Schacht, T
Gawlitza, A
Albrecht, P
Aktas, O
Koop, B
Gliem, M
Hofstetter, H H
Zanger, K
Bultynck, G
Parys, J B
De Smedt, H
Kindler, T
Adams-Quack, P
Hahn, M
Waisman, A
Reed, J C
Hövelmeyer, N
Methner, A
Article History
Received: 7 November 2014
Revised: 20 July 2015
Accepted: 21 July 2015
First Online: 16 October 2015
Competing interests
: The authors declare no conflict of interest.