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Article History

Received: 19 December 2017

Accepted: 12 February 2018

First Online: 20 February 2018

Ethics approval and consent to participate

: A written consent was received from all patients. Ethics approval was received from the Ethics Committee of the Witten–Herdecke University (Approval No.11/2016).

: A written consent was received from all patients or their legal representatives for the use of their data and specimens for research purposes.

: The authors declare that they have no competing interests.

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