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Britain's Prince William (L), Duke of Cambridge, Britain's Catherine (2L), Duchess of Cambridge, adjusts Jon Salmon's (R) headband as Steve Jackson (C) looks on at the Institute of Contemporary Arts in central London on January 17, 2017 during a briefing to outline new agendas and aims for 2017 for the mental health charity Heads Together. Heads Together is a charity supported by the Duke and Duchess of Cambridge and Prince Harry that brings together a number of organisations to tackle stigma and change the conversation on mental health. / AFP / POOL / STEFAN WERMUTH (Photo credit should read STEFAN WERMUTH/AFP/Getty Images)

Britain's Prince William (L), Duke of Cambridge, Britain's Catherine (2L), Duchess of Cambridge, adjusts Jon Salmon's (R) headband as Steve Jackson (C) looks on at the Institute of Contemporary Arts in central London on January 17, 2017 during a briefing to outline new agendas and aims for 2017 for the mental health charity Heads Together. 
Heads Together is a charity supported by the Duke and Duchess of Cambridge and Prince Harry that brings together a number of organisations to tackle stigma and change the conversation on mental health. / AFP / POOL / STEFAN WERMUTH        (Photo credit should read STEFAN WERMUTH/AFP/Getty Images)