Funding for this research was provided by:
Received: 25 September 2020
Accepted: 11 January 2021
First Online: 4 February 2021
Ethics approval and consent for publication
: The study design is following the guidelines of the Hannover Medical School ethics committee for retrospective analyses of anonymized samples. All authors have read the manuscript in its final form and approved submission.
: The authors declare that they have no competing interests.