The lack of a data safety monitoring board is "sub-optimal, " says Steven Joffe, a bioethicist and researcher at the Dana Farber Cancer Center.

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An investigation by Northumbria Police and the Health and Safety Executive found that NEMOC and one of its directors, Christopher Taylor, failed to ensure the safety of its employees and sub-contracted worker.

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The CCK said "sub-standard components" were often used which had not been put through safety checks and might emit higher than recommended radiation levels.

BBC: Kenya to switch off 'fake' mobile phones