An FDA panel backed the drug, but then a series of experts wrote letters to the FDA arguing that the data were not adequate for approval.

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An independent panel of experts will advise the FDA and vote on the drug's safety, efficacy and approval on Friday.

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The surf reef's approval ended years of speculation over whether it would go ahead, during which time world experts carried out feasibility studies and local residents were consulted.

BBC: NEWS | UK | England | Dorset | Last chance for surf reef debate