Received: 22 February 2020
Accepted: 6 May 2020
First Online: 14 May 2020
Ethics approval and consent to participate
: The study has been approved by the institutional ethics committee of the Charité-Universitätsmedizin Berlin (EA4/067/13) and complied with the Declaration of Helsinki. All examinations had a clinical indication and patients gave their consent on using their anonymized data for study purposes.
: Not applicable.
: The authors declare that they have no competing interests.