Ages Decreased at first campaign (1999-2003) (%) Decreased at second campaign (2004-2007) (%) 1-14 44.20 76.77 Under 1 29.12 46.16 Over 14 44.90 66.51 total 43.28 72.87

Table 7: The percentage of decreased incidence from difference period of campaign (%) comparing with the previous period incidence.

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