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He said ministry would respond to Piot once it had received his letter He said the ministry would respond to Piot once it had received his letter NegativeLONDON Scientists in Britain expressed concern on Thursday after at least 17 delegates from Africa and Asia wanting to attend a health conference in London were denied visas http://www.reuters.com/places/africa/article/us-science-britain-visas/scientists-angry-at-uk-visa-denials-for-african-asian-researchers-idUSKBN1ND2B02018-11-09