Ziegler, Verena
Henninger, Christian http://orcid.org/0000-0001-6050-1518
Simiantonakis, Ioannis
Buchholzer, Marcel
Ahmadian, Mohammad Reza
Budach, Wilfried
Fritz, Gerhard
Article History
Received: 16 March 2017
Revised: 22 June 2017
Accepted: 2 July 2017
First Online: 10 August 2017
Competing interests
: The authors declare no conflict of interest.