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Article History

Received: 26 September 2020

Accepted: 30 March 2021

First Online: 9 April 2021

Declarations

:

: The study was approved by and conducted according to the guidelines of the Norwegian Centre for Research Data (NSD), (project # 53124, approved 23.05.17), thus ensuring anonymity and data protection. The NBHS approved the use and analysis of the data (internal reference 2017/1033, approved 20.02.2017).

: Not applicable.

: None declared.