Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (IFB 01EO1401)
Article History
Received: 1 March 2019
Revised: 14 May 2019
Accepted: 16 May 2019
First Online: 22 May 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study was approved by the ethics committee of the Bavarian Chamber of Physicians, Munich (FF4: EC No. 06068).