Sperber, Katja http://orcid.org/0000-0002-4121-0026
Steinbrecher, Tina http://orcid.org/0000-0003-3282-6029
Graeber, Kai
Scherer, Gwydion http://orcid.org/0000-0001-9246-5726
Clausing, Simon
Wiegand, Nils
Hourston, James E. http://orcid.org/0000-0002-4183-8673
Kurre, Rainer
Leubner-Metzger, Gerhard http://orcid.org/0000-0002-6045-8713
Mummenhoff, Klaus http://orcid.org/0000-0002-8449-1593
Article History
Received: 10 February 2017
Accepted: 2 November 2017
First Online: 30 November 2017
Competing interests
: The authors declare no competing financial interests.