Vaccine Expert: Pulling “Vaxxed” From Tribeca Film Festival Is Honorable Thing To DoDr. Paul Offit, of the Children's Hospital of Philadelphia, is a renowned vaccine expert.
Hottest Social Media Craze Allows Users To Share Short VideosHave you heard of Vine? Twitter launched the video-sharing app in January, and it has quickly become the hottest, new social media craze.

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