Funding for this research was provided by:
Universität Leipzig (IN-1260910)
Text and Data Mining valid from 2020-02-27
Received: 11 March 2019
Accepted: 13 February 2020
First Online: 27 February 2020
Ethics approval and consent to participate
: The study was approved by the local ethical commission board from the University of Leipzig (AZ EK: 111–16-14032016). Due to the retrospective design of the study and accordingly national guidelines, the local ethic committee confirmed, that informed consent was not necessary from participants.
: Not applicable.
: The authors declare that they have no competing interests.