Funding for this research was provided by:
Open Access Publication Fund of Charité – Universitätsmedizin Berlin
Received: 9 August 2019
Accepted: 15 April 2020
First Online: 8 May 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of the Charité – Universitätsmedizin Berlin, Germany (application number: EA1/005/18).All participants gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.