Received: 5 November 2019
Accepted: 3 June 2020
First Online: 15 June 2020
Ethics approval and consent to participate
: The local ethics committee of the Charité – Universitätsmedizin Berlin, granted ethical approval (reference no. EA1/269/13). Signed informed consent to participate was obtained from all patients.
: Not applicable.
: The authors declare that they have no competing interests.