Received: 6 September 2019
Accepted: 25 May 2020
First Online: 5 June 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the ethics committee of the Charité University Medicine in March of 2015 (EA1/051/15). This study was conducted in agreement with the Declaration of Helsinki.
: Not applicable.
: The authors declare no conflicts of interest relevant to this work.