Republican presidential candidate Herman Cain speaks before Florida's straw poll at the Orange County Convention Center in Orlando on Saturday. Cain won the straw poll with 37 percent of the vote. Mark Wilson/Getty Images hide caption

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Mark Wilson/Getty Images

Republican presidential candidate former Massachusetts Gov. Mitt Romney, right, makes a point as Texas Gov. Rick Perry listens, during a debate in Orlando, Fla. Phelan M. Ebenhack/AP hide caption

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Phelan M. Ebenhack/AP

Bioethicists Offer Reward For Proof On HPV Vaccine Claim

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NPR's Don Gonyea reported earlier on Morning Edition.

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