Article History
Received: 13 August 2018
Accepted: 22 October 2018
First Online: 6 November 2018
Ethics approval and consent to participate
: All participants provided written informed consent prior to participating in the study, which received approval from the local ethics committee Ethikkommission Nordwest- und Zentralschweiz (registration number: 2016–00539).
: Not applicable.
: The authors declare that they have no competing interests.
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