Received: 26 March 2020
Accepted: 20 August 2020
First Online: 10 September 2020
Ethics approval and consent to participate
: The institutional review board of the Martin-Luther-University Halle-Wittenberg approved this study (file number 2013–92). The need for an individual patient information and signed informed consent was waived. The hospital has not required any further permission to access the medical records of patients of this retrospective study.
: Not applicable.
: The authors declare that they have no competing interests.