Schneider, Udo
Schmid, Andreas
Linder, Roland
Horenkamp-Sonntag, Dirk
Verheyen, Frank
Article History
First Online: 23 July 2018
Compliance with Ethical Standards
:
: No funding was received for the study. Udo Schneider, Andreas Schmid, Roland Linder, Dirk Horenkamp-Sonntag, and Frank Verheyen declare that they have no conflicts of interest.