Schaff, Florian
Bech, Martin
Zaslansky, Paul
Jud, Christoph
Liebi, Marianne
Guizar-Sicairos, Manuel
Pfeiffer, Franz
Article History
Received: 25 June 2015
Accepted: 22 September 2015
First Online: 18 November 2015
Competing interests
: The authors declare no competing financial interests.