Received: 12 July 2019
Accepted: 17 February 2020
First Online: 4 March 2020
Ethics approval and consent to participate
: This study was approved by the Swedish National Data Inspection Board and the Regional Ethical Review board in Linköping. In compliance with recommendations of the Research Ethics Committee of the region Maastricht, the survey study in the Netherlands did not need approval. All procedures performed in studies involving human participants were in accordance with the ethical standards of the Medical Research Involving Human Subjects Act (WMO), and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study abides by the European General Data Protection Regulation (GDPR).Participants in the Netherlands were informed about the study and its procedures. Individuals who agreed to participate in the panel received a confirmation email with a login code, at which point they confirmed their willingness to take part, and could immediately start the questionnaire. Participants provided written consent by accessing and completing the online questionnaire. Participants in Sweden were contacted via phone and offered to be a member in the webpanel. They were then sent an email where they had to verify that they want to become members. This procedure provided written consent to become members of the webpanel and participants could then receive invitations. Participants provided written consent to participate in the questionnaire by accessing and completing the online questionnaire.
: Not applicable
: The authors declare that they have no competing interests.