Beckert, Bertrand
Kedrov, Alexej
Sohmen, Daniel
Kempf, Georg
Wild, Klemens
Sinning, Irmgard
Stahlberg, Henning http://orcid.org/0000-0002-1185-4592
Wilson, Daniel N
Beckmann, Roland
Article History
Received: 28 November 2014
Accepted: 13 August 2015
First Online: 7 September 2015
Competing interests
: The authors declare no competing financial interests.