Figure 1From: Trends in the knowledge, attitudes and practices of travel risk groups towards prevention of malaria: results from the Dutch Schiphol Airport Survey 2002 to 2009Flowchart of the Dutch Schiphol Airport Survey. The yearly inclusions of respondents of the malaria questionnaires (Q-mal) and vaccination questionnaires (Q-vacc) in the study are shown as well as reasons for exclusion.Back to article page