Received: 18 June 2020
Accepted: 31 August 2020
First Online: 11 September 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the medical faculty of Leipzig University, Germany (No. 378/15–05102015). All participants were informed verbally and in writing and provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.