Received: 21 October 2020
Accepted: 31 January 2021
First Online: 22 February 2021
Change Date: 15 April 2021
Change Type: Update
Change Details: The funding note was not incorporated in the original publication. The article has been updated to rectify the error.
Ethics approval and consent to participate
: Research has been performed in accordance with the Declaration of Helsinki, the ethics committee of the University of Bonn approved the study (No. 222/12) and all participants provided written informed consent.
: Not applicable.
: All authors have no conflicts of interest to declare.