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Article History

Received: 27 July 2017

Accepted: 11 January 2018

First Online: 30 January 2018

Ethics approval and consent to participate

: Prior to inclusion into the database each patient gave informed consent. Ethics approval was obtained from local ethics committees prior to start of the evaluation. Local ethics committees are represented by the locations listed after each author’s name and after each co-worker’s name as provided in Additional file .

: Not applicable.

: The authors declare that they have no competing interests.

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