Hartung, Benno
Schaper, Julia
Fischer, Katinka
Ritz-Timme, Stefanie
Article History
Received: 18 July 2018
Accepted: 11 September 2018
First Online: 19 September 2018
Compliance with ethical standards
: The examinations of this study comply with the current German laws. The study protocol was pre-approved by the ethics committee of the University Hospital Düsseldorf.
: The authors declare that they have no conflict of interest.