Blasel, Stella http://orcid.org/0000-0002-0717-616X
Alex, Sarah
Ackermann, Hanns
Tichy, Julia
Berkefeld, Joachim
Wagner, Marlies
Article History
Received: 7 May 2017
Accepted: 9 September 2017
First Online: 30 September 2017
Conflict of interest
: S. Blasel, S. Alex, H. Ackermann, J. Tichy, J. Berkefeld and M. Wagner declare that they have no competing interests.