Text and Data Mining valid from 2019-09-04
Received: 6 February 2019
Accepted: 22 May 2019
First Online: 4 September 2019
Ethics approval and consent to participate
: All patients gave express written informed consent. This retrospective analysis is in compliance with the principles of the Declaration of Helsinki and its subsequent amendments. This work was approved by the Ethics Committee of the Ludwig Maximilian University of Munich.
: Not applicable.
: The authors declare that they have no competing interests.