Girsberger, Michael http://orcid.org/0000-0001-8318-0489
Muff, Catherine
Hösli, Irene
Dickenmann, Michael Jan
Article History
Received: 12 October 2017
Accepted: 30 April 2018
First Online: 21 May 2018
Ethics approval and consent to participate
: This study was approved by the Swiss Ethic Committee of northwest and central Switzerland as part of the swissethics association to be conducted under Art. 34 HFG, ART. 37-40 HFV of Swiss Federal Law waiving the need for consent.
: The authors declare that they have no competing interests.
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