Hage, Elias
Espelage, Werner
Eckmanns, Tim
Lamson, Daryl M.
Pantó, Laura
Ganzenmueller, Tina
Heim, Albert
Article History
Received: 21 July 2016
Accepted: 9 December 2016
First Online: 13 January 2017
Competing interests
: The authors declare no competing financial interests.