Fredin, Ola
Viola, Giulio http://orcid.org/0000-0002-8383-3328
Zwingmann, Horst
Sørlie, Ronald
Brönner, Marco
Lie, Jan-Erik
Grandal, Else Margrethe
Müller, Axel
Margreth, Annina http://orcid.org/0000-0002-6055-7316
Vogt, Christoph
Knies, Jochen
Article History
Received: 22 August 2017
Accepted: 19 September 2017
First Online: 15 November 2017
Competing interests
: The authors declare no competing financial interests.