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Article History

Received: 7 April 2020

Accepted: 13 July 2020

First Online: 29 July 2020

Ethics approval and consent to participate

: All procedures followed were in accordance with the ethical standards of the responsible ethical review board and with the Helsinki Declaration of 1964 and later versions. Ethical approval was received from the local ethical review board (D416/19) of the University Hospital Schleswig-Holstein, Kiel, Germany, which allowed us to use patient material from those patients who had given written informed consent for a future scientific use of their samples and data. Accordingly, all patients included in this study had given written informed consent for their therapeutic surgery as well as for the prospective future scientific use of their patient material and data.

: Not applicable.

: The authors declare that they have no competing interests.