Recruitment of participants
INFLUENZA EPIDEMIC, MYOCARDIAL INFARCTION, INFLUENZA, INFLUENZA
Participants were recruited from three different media outlets.Participants from the Dutch newspaper (called AD) were informed about our campaign study through a news article in the (online) newspaper, in which the importance of taking the Influenza vaccination was emphasized, especially for high risk people e.g. people with a particular migration background. People were subsequently asked to participate in an online survey, originating from Qualtrics, by clicking on the attached link.Participants recruited from FB were shown a Facebook advertisement indicating the risk of a myocardial infarction during an influenza epidemic, followed by the question “Does vaccination help?”. People were subsequently asked to fill out a survey, referring to the link to the online survey from Qualtrics.Participants from the local Indian radio station were recruited through the radio through an interview on the subject of vaccination, short radio spots, and an advertisement on their website and Facebook page. During the live interview, broadcasted twice, listeners were invited to fill out the survey with translation support from the radio presenter. The radio spot was broadcasted for 3 weeks (4 spots per day), and voiced by an Indian communicator (Dutch cardiologist from Surinamese origin with ancestors from India), by which influenza vaccination was promoted. In both the interview and the radio spot, the importance of vaccination in relation to protection of the community was emphasized, as supported by Foxworth et al.