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Additional file 1: Supplementary Table 1. Differences in baseline characteristics between those lost to follow-up and the sample for analysis (N = 5207)1. Supplementary Table 2. Differences in intervention effects in the intervention group between those who perceived the intervention program and those who did not (N = 791). Supplementary Figure 1. Intergenerational greeting campaign logo and slogan. Supplementary Figure 2. Intergenerational greeting campaign goods (banners, badges, and stationery).