Text and Data Mining valid from 2019-04-11
Received: 30 January 2019
Accepted: 1 April 2019
First Online: 11 April 2019
Ethics approval and consent to participate
: This study was approved by the local ethics committee of our university, medical faculty, University of Heidelberg with the number of IRB approval: S-175/2017 (10.05.2017).
: Not applicable.
: The authors declare that they have no competing interests.
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