Michael, Victoria
Frank, Oliver
Bartling, Pascal
Scheuner, Carmen
Göker, Markus
Brinkmann, Henner
Petersen, Jörn
Article History
Received: 29 July 2015
Revised: 12 January 2016
Accepted: 24 January 2016
First Online: 8 March 2016
Competing interests
: The authors declare no conflict of interest.