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. 2017 Jun 2;3(2):e33. doi: 10.2196/publichealth.7545

Figure 1.

Figure 1

Example Facebook recruitment ads for Outsmart HPV (human papillomavirus). All ads were News Feed ads, and experimental factors included: image type (single person, couple, group, or doctor), content focus (HPV or HPV vaccine), and disease framing (cancer or sexually transmitted disease [STD]).