Text and Data Mining valid from 2019-12-01
Received: 30 August 2018
Accepted: 24 October 2019
First Online: 9 December 2019
Ethics approval and consent to participate
: The study was approved by the ethics commission of Klinikum rechts der Isar, Technical University Munich. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: The authors declare that they have no competing interests.