Their views, of course, affect the fortunes of Parexel, PPD, Charles River Laboratories, Covance and many others.

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Another firm, Parexel, which conducted the trial, said it was following procedure.

BBC: NEWS | UK | Wales | Drug trial man refuses more tests

Although the Global Alliance of Publication Professionals (GAPP) cannot answer the questions that Mr Yates posed directly to Isabelle Leach and PAREXEL, we welcome the opportunity to answer the questions you have asked.

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