Received: 19 June 2020
Accepted: 4 August 2020
First Online: 20 August 2020
Ethics approval and consent to participate
: Our study was approved by the institutional ethics committee and informed consent was waived (file number: 20-9310-BO, date: 6 May 2020). The study was registered at the German Clinical Trials registry (trial number: DRKS00021675, date 8 May 2020). Patients and the public were not involved in this study.
: Not applicable
: The authors state that they have no competing interests.