Article History
Received: 19 November 2019
Revised: 1 September 2020
Accepted: 5 October 2020
First Online: 13 October 2020
Change Date: 19 July 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1007/s00428-021-03150-1
Compliance with ethical standards
: Specimen collection was conducted with informed consent in accordance with the ethics guidelines for the use of human material, approved by the Ethics Committee of the University of Rostock (reference number: A2017-0159).
: All authors approved the final version of the manuscript and agreed to be accountable for all aspects of the work.
: The authors declare that they have no conflict of interest.