Text and Data Mining valid from 2019-05-09
Received: 1 October 2018
Accepted: 23 April 2019
First Online: 9 May 2019
Ethics approval and consent to participate
: The study was approved by the local ethics committee of the Medical Faculty, Christian-Albrechts University Kiel (reference no. A110/99) and performed in accordance with the Declaration of Helsinki. All patients participating in this study, gave their written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
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