Funding for this research was provided by:
Universität Hamburg (NFW-16/05)
Text and Data Mining valid from 2019-08-09
Received: 22 March 2019
Accepted: 30 July 2019
First Online: 9 August 2019
Ethics approval and consent to participate
: The study was approved by the Ethical Review Board of Magdeburg, Germany (45/15). All patients gave their informed consent to participate in the study.
: Not applicable.
: The authors declare that they have no competing interests.