Fritz, Teresa http://orcid.org/0000-0003-4470-8011
Schöfl, Rainer
Wewalka, Friedrich
Ziachehabi, Alexander
Article History
Received: 31 July 2018
Accepted: 7 November 2018
First Online: 5 December 2018
Conflict of interest
: T. Fritz, R. Schöfl, F. Wewalka, and A. Ziachehabi declare that they have no competing interests.