Malkemper, E. Pascal
Eder, Stephan H. K.
Begall, Sabine
Phillips, John B.
Winklhofer, Michael
Hart, Vlastimil
Burda, Hynek
Article History
Received: 24 November 2014
Accepted: 23 March 2015
First Online: 29 April 2015
Competing interests
: The authors declare no competing financial interests.