Participants
Passers-by assessed by the interviewers to be above the age of 18 were selectively approached to attain a wide distribution of age and sex. The number and sex of passers-by who refused to participate or did not respond were recorded. Sociodemographic data (age, sex, level of education and employment status) for every 10th non-participant was collected. If the 10th non-participant refused to answer these questions, the following non-participant was asked until data was obtained.Potential participants were not included if they were illiterate, had insufficient Danish language skills or were too busy to commit the necessary time (at least 5 minutes) for the interview.