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Article History

Received: 22 August 2018

Accepted: 27 September 2018

First Online: 5 October 2018

Ethics approval and consent to participate

: The study was approved by the ethics committee of Zurich (Switzerland) (2017–00311). All participants have been informed and gave written consent prior to data collection.

: Not applicable

: The authors declare that they have no competing interests.

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