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Article History

Received: 20 September 2020

Accepted: 24 January 2021

First Online: 4 February 2021

Change Date: 18 February 2020

Change Type: Update

Change Details: Peer review report (Author response of 18 Dec 2020) has been updated.

Ethics approval and consent to participate

: The study was conducted in compliance with ethical standards. The biological material and health-related data were studied anonymously. The use of archived tissue samples for retrospective analysis was approved by the Ethics Committee of the Canton of Bern (KEK 2014/200) which provided a waiver of the need for informed consent.

: Not applicable.

: The authors declare that they have no competing interests.