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Article History

Received: 12 June 2018

Accepted: 17 December 2018

First Online: 8 January 2019

Ethics approval and consent to participate

: The project was approved by the Danish Data Protection Agency (file number: 2013-41-2104). In accordance with s 14(2) of the Danish Act on Research Ethics Review of Health Research Projects, Act No. 593 of 14 July 2011 and later amendments, notification of questionnaire surveys and medical database research projects to the research ethics committee system is only required if the project involves human biological material. The research ethics committee of the Radboud University Medical Center (CMO Arnhem-Nijmegen) was consulted and concluded that the study does not fall under the Medical Research Involving Human Subjects Act (WMO) (file number: 2013/379).According to Swiss law on research involving human beings, anonymously collected data require no approval by the regional ethics committees [].According to Danish law, no informed consent is required in survey studies if no health risks are involved []. Agreement to participate is implied when the questionnaire is filled out and returned. Members of the Dutch and Swiss consumer panels participated on a voluntary basis and gave informed consent at the start of their membership.

: Not applicable.

: The authors declare that they have no competing interests.

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