Herzner, Anna-Maria
Wolter, Steven
Zillinger, Thomas
Schmitz, Saskia
Barchet, Winfried
Hartmann, Gunther
Bartok, Eva
Schlee, Martin
Article History
Received: 28 June 2016
Accepted: 3 November 2016
First Online: 12 December 2016
Competing interests
: G.H. is co-founder and shareholder of the Rigontec GmbH. All other authors declare no competing financial interests.