Funding for this research was provided by:
Federal Ministry for Education and Research of Germany (ICGC_II FKZ 101KU1505B)
Received: 29 April 2019
Accepted: 20 September 2019
First Online: 12 October 2019
Ethics approval and consent to participate
: The ethics committee of the Ärztekammer Hamburg approved this study (WF-049/09). According to local laws (HmbKHG, §12a) informed consent was not required for this study.
: Not applicable.
: The authors declare that they have no competing interests.