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Article History

Received: 24 December 2020

Accepted: 1 February 2021

First Online: 17 February 2021

Compliance with ethical standards

:

: The authors have no conflict of interest to declare.

: All procedures performed in studies involving human participants were under the institutional and/or national research committee's ethical standards and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

: The human materials were obtained from archived paraffin blocks that were remnants of what was used for pathologic diagnosis. Informed consent was not required by the Institutional Review Board.