Text and Data Mining valid from 2018-07-03
Received: 4 September 2017
Accepted: 12 June 2018
First Online: 3 July 2018
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the University Hospital of the Ludwig-Maximilians-University Munich (LMU). Written informed consent was waived by the Ethics Committee as data were de-identified and analysed anonymously.
: Not applicable.
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