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Article History

Received: 26 February 2018

Accepted: 17 July 2018

First Online: 24 July 2018

Ethics approval and consent to participate

: The research project with all its procedures was granted approval by the local Ethical Committee of the University of Tübingen and is in accordance with national law and the World Medical Association Declaration of Helsinki (1964) with its ethical principles for medical research involving Human Subjects and subsequent amendments. Only previously collected data were used in this study and no participants were involved. All patients had given informed written consent to their information being used in future studies.

: Not applicable.

: The authors declare that they have no competing interests.

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