Funding for this research was provided by:
Schweizerische Akademie der Medizinischen Wissenschaften (n/a)
Text and Data Mining valid from 2018-11-26
Received: 9 May 2018
Accepted: 8 November 2018
First Online: 26 November 2018
Change Date: 18 April 2019
Change Type: Correction
Change Details: It has come to our attention that in the original article  information regarding dates was omitted. The data in this study were obtained in Switzerland four years before the entering into force of the new Swiss Human Research Act in 2014, when the guidelines of the Swiss Academy of Medical Sciences (SAMS) ceased to apply. It is important for readers to know that at the time of the study there was no binding law in Switzerland, only the more open SAMS guidelines that have a different legal status. We would expect to find less variation of opinions among research ethics committee members if the study were repeated after the federal law came into force.
Ethics approval and consent to participate
: Ethics approval for this study was not required. Participants were informed that returning a completed questionnaire constituted consent to participate in the study.
: Participants were informed that all data from the study would be published in anonymous form only, and that returning a completed questionnaire constituted consent to this.
: The authors declare that they have no competing interests.
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