Ethics approval and consent to participate
The study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the local Ethics Committee of Medical Faculty, Martin Luther University Halle-Wittenberg, number 2020–078, date of approval 11.06.2020. Patient consent was waived as the data were only analyzed in an anonymized form. The study was approved by the local ethics commission of the Medical Faculty of the University Halle-Wittenberg.