Received: 28 May 2020
Accepted: 26 July 2020
First Online: 18 August 2020
Ethics approval and consent to participate
: Ethical committees in Germany gave the required ethical approvals for the respective studies (128/13 EK, 127/13 EK, EA1/025/1, EA1/193/10, EA1/269/13). Signed informed consent to participate was obtained from all patients.
: Not applicable.
: The authors declare that they have no competing interests.