Funding for this research was provided by:
University Medical Center Göttingen (none)
Text and Data Mining valid from 2018-07-06
Received: 11 December 2017
Accepted: 4 June 2018
First Online: 6 July 2018
Ethics approval and consent to participate
: This study was approved by the local Ethics Committee (application number 22/4/15), and all participants provided written consent.
: Not applicable.
: The authors declare that they have no competing interests.
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