Neugebauer, Martin
Woźniak, Paweł
Bag, Ankan https://orcid.org/0000-0002-2029-825X
Leuchs, Gerd
Banzer, Peter
Article History
Received: 11 December 2015
Accepted: 8 March 2016
First Online: 20 April 2016
Competing interests
: The authors declare no competing financial interests.