Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (not applicable)
Text and Data Mining valid from 2019-09-02
Received: 17 May 2019
Accepted: 16 August 2019
First Online: 2 September 2019
Ethics approval and consent to participate
: 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 study has been approved by the local ethics committee. Wherever necessary informed consent from the patients has been obtained.
: The authors declare that they have no competing interests.