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Article History

Received: 28 July 2019

Accepted: 28 July 2020

First Online: 6 August 2020

Change Date: 8 December 2020

Change Type: Update

Change Details: Open Access Funding note was added to backmatter text of the article. This article has been updated to correct this.

Ethics approval and consent to participate

: All procedures involving patient material were approved by the Ethics Committee of the Medical faculty, University of Rostock (reference number II HV 43/2004) in accordance with generally accepted guidelines for the use of human material.

: Not applicable.

: The authors declare that they have no competing interests.