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Article History

Received: 21 September 2019

Accepted: 19 December 2019

First Online: 2 January 2020

Ethics approval and consent to participate

: The cantonal Ethics Committee of Berne did not require ethical approval, as this study is not covered by the Swiss Human Research Act. Written consent was obtained from all participants prior to the start of the study.

: Not applicable.

: The authors declare that they have no conflicts of interest.