Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (GL236/11-1, KL2742/2-1, BE4393/1-1)
Received: 17 March 2020
Accepted: 3 June 2020
First Online: 17 June 2020
Ethics approval and consent to participate
: The Ethics Committee of the Technical University Munich approved the retrospective analysis (permit 115/18 S), and the requirement to obtain informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.