Faust, Isabel
Traut, Philipp
Nolting, Frank
Petschallies, Jan
Neumann, Elena
Kunisch, Elke
Kuhn, Joachim
Knabbe, Cornelius
Hendig, Doris
Article History
Received: 18 February 2015
Accepted: 1 July 2015
First Online: 28 July 2015
Competing interests
: The authors declare no competing financial interests.