Spies, Christian K.
Schäfer, Melanie
Langer, Martin F.
Bruckner, Thomas
Müller, Lars P.
Unglaub, Frank
Article History
Received: 10 July 2017
Accepted: 2 January 2018
First Online: 16 January 2018
Compliance with ethical standards
:
: Spies CK, Unglaub F received honoraria from Richard Wolf GmbH Knittlingen, Germany, for work shops not related to this study. Schäfer M, Bruckner T, Langer M, Müller LP have no conflict of interest.
: All procedures performed were in accordance with the ethical standards of the institutional ethics committee and with the 1964 Helsinki declaration.