The Duke Of Cambridge Attends Screening Of BBC's 'Mind Over Marathon' Documentary To Launch BBC Mental Health Season [Getty Images]

LONDON, ENGLAND - APRIL 18: Prince William, Duke of Cambridge attends a reception where he meets TV presenter Nick Knowles (R), runners who feature in the documentary and the production team involved in the filming ahead of the screening of the BBC documentary 'Mind over Marathon' at BBC Radio Theatre on April 18, 2017 in London, England. The screening also launches the BBC season on mental health. (Photo by Chris Jackson - WPA Pool/Getty Images)

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