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Article History

Received: 17 July 2017

Accepted: 21 December 2017

First Online: 7 February 2018

Ethics approval and consent to participate

: This study was approved by the ethics committee of the University of Göttingen Medical School (number 9/2/13). All patients involved agreed to participate in the study after having given their written informed consent.

: Not applicable.

: The authors declare that they have no competing interests.

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