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Article History

Received: 19 October 2020

Accepted: 15 February 2021

First Online: 6 March 2021

Ethics approval and consent to participate

: This research was done under the legislation of Swiss national law “Krebsregistergesetz” (KRG; SR 818.33). It is not subject to ethics approval and was reviewed and accepted by the internal scientific oversight committee of the cancer registry. The research did not involve human participants. There was no primary data collection during this project. In this project anonymised and routinely collected data is used, collected as part of a cantonal cancer registration program, and aggregated prior to analysis. Cancer registration itself was approved by the cantonal etics committee of Zurich, BASEC number PB_2016–01643.

: Not applicable.

: The authors declare to have no conflicts of interest.