From a total of 938 eligible individuals, 868 (92.5%) were included in the analysis ( Figure 1 ). Overall, 479 (55.2%) were females and 389 (44.8%) males. The great majority of participants (503, 57.9%) were between 18 and 35 years old with a median age of 32 years (range 18 -84 yrs). Only 46 (5.3%) responders were above 64 years of age. In general, participants were highly educated with 480 (55.3%) being university graduates. Overall, the characteristics of participants planning to travel to resource-limited destinations are presented in Table 1 . 