Köckerling, F.
Simon, T.
Adolf, D.
Köckerling, D.
Mayer, F.
Reinpold, W.
Weyhe, D.
Bittner, R.
Article History
Received: 21 March 2018
Accepted: 17 December 2018
First Online: 2 January 2019
Compliance with ethical standards
:
: Simon T, Adolf D, Köckerling D, Mayer F, Reinpold W, Weyhe D, and Bittner R have no conflicts of interest or financial ties to disclose.