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JK and KR contributed equally.
Contributors JK and KR performed morphological and immunohistochemical studies, analysed the data and wrote the manuscript. TH and PL-K performed morphological studies. EP and UW contributed cases and clinical data and revised the manuscript. CT designed the research, performed morphological studies and revised the manuscript. All authors read and approved the final version of the manuscript.
Competing interests None declared.
Ethics approval Ethics Committee Luebeck.
Provenance and peer review Not commissioned; externally peer reviewed.
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