Hitzl, Wolfgang
Heisinger, Stephan
Hobusch, Gerhard M.
Frank, Konstantin
Cotofana, Sebastian
Article History
First Online: 26 July 2018
Compliance with ethical guidelines
:
: W. Hitzl, S. Heisinger, G.M. Hobusch, K. Frank and S. Cotofana declare that they have no competing interests.
: Institutional Review Board (IRB) approval was not required.