Boehm, K.
Duckheim, M.
Mizera, L.
Groga-Bada, P.
Malek, N.
Kreth, F.
Gawaz, M.
Zuern, C. S.
Eick, C.
Article History
Received: 3 October 2017
Accepted: 2 March 2018
First Online: 12 April 2018
Compliance with ethical standards
: The study got approval from the Clinical Ethics Committee of the University Hospital Tuebingen. The need for written informed consent was waived by the ethics committee.
: The authors declare that they have no conflict of interest.