Funding for this research was provided by:
Medizinischen Fakultät, Eberhard Karls Universität Tübingen (2565-0-0)
Received: 10 May 2020
Accepted: 4 June 2020
First Online: 15 June 2020
Compliance with ethical standards
: The Ethics Board of the Medical Faculty and the University Hospital of Tübingen approved this retrospective analysis (No. 018/2019BO2).
: The authors declare that they have no conflict of interest.