Received: 17 May 2020
Accepted: 19 August 2020
First Online: 7 September 2020
Ethics approval and consent to participate
: The analyses were approved by the Data Security Management and Institutional Review Board of Hannover Medical School (Approval #8973_BO_K_2020).
: This manuscript does not contain any individual person’s data in any form (not applicable).
: The authors have no competing interests to report.