Text and Data Mining valid from 2019-09-13
Received: 19 May 2019
Accepted: 26 August 2019
First Online: 13 September 2019
Compliance with ethical standards
: The authors declare no competing interests.
: The ethics committee of the University Hospital Leipzig in Germany granted ethical approval (ref. no. 044/14032016). The committee is listed in the Institutional Review Board (IRB) of the Office for Human Research Protections (OHRP) IORG0001320, IRB00001750.
: Before the beginning of the study all patients were informed and gave their written consent to treatment contract, the study as well as to the publication of their anonymised data.