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The Duchess of Cambridge speaks to Dr Mark Haden during a visit to Kings College Hospital in south London where she met staff and patients who were affected by the terrorist attacks in London Bridge and Borough Market, on June 12, 2017 in London, England. (Photo by Dominic Lipinski - WPA Pool / Getty Images)

The Duchess of Cambridge speaks to Dr Mark Haden during a visit to Kings College Hospital in south London where she met staff and patients who were affected by the terrorist attacks in London Bridge and Borough Market, on June 12, 2017 in London, England.  (Photo by Dominic Lipinski - WPA Pool / Getty Images)

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LONDON, ENGLAND - JUNE 12: Catherine, Duchess of Cambridge arrives at Kings College Hospital to meet staff and patients who were affected by the terrorist attacks in London Bridge and Borough Market on June 12, 2017, London, England. (Photo by Dominic Lipinski - WPA Pool / Getty Images)

LONDON, ENGLAND - JUNE 12: Catherine, Duchess of Cambridge arrives at Kings College Hospital to meet staff and patients who were affected by the terrorist attacks in London Bridge and Borough Market on June 12, 2017, London, England.  (Photo by Dominic Lipinski - WPA Pool / Getty Images)

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The Duchess of Cambridge speaks to Clinical Director and Consultant in Emergency Medicine Dr Malcolm Tunnicliff during a visit to Kings College Hospital in south London where she met staff and patients who were affected by the terrorist attacks in London Bridge and Borough Market, on June 12, 2017 in London, England. (Photo by Dominic Lipinski - WPA Pool / Getty Images)

The Duchess of Cambridge speaks to Clinical Director and Consultant in Emergency Medicine Dr Malcolm Tunnicliff during a visit to Kings College Hospital in south London where she met staff and patients who were affected by the terrorist attacks in London Bridge and Borough Market, on June 12, 2017 in London, England.  (Photo by Dominic Lipinski - WPA Pool / Getty Images)

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The Duchess of Cambridge speaks to Team Leader Ellen (left, surname not given) during a visit to Kings College Hospital in south London where she met staff and patients who were affected by the terrorist attacks in London Bridge and Borough Market, on June 12, 2017 in London, England. (Photo by Dominic Lipinski - WPA Pool / Getty Images)

The Duchess of Cambridge speaks to Team Leader Ellen (left, surname not given) during a visit to Kings College Hospital in south London where she met staff and patients who were affected by the terrorist attacks in London Bridge and Borough Market, on June 12, 2017 in London, England.  (Photo by Dominic Lipinski - WPA Pool / Getty Images)

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The Duchess of Cambridge during a visit to Kings College Hospital in south London where she met staff and patients who were affected by the terrorist attacks in London Bridge and Borough Market, on June 12, 2017 in London, England. (Photo by Dominic Lipinski - WPA Pool / Getty Images)

The Duchess of Cambridge during a visit to Kings College Hospital in south London where she met staff and patients who were affected by the terrorist attacks in London Bridge and Borough Market, on June 12, 2017 in London, England.  (Photo by Dominic Lipinski - WPA Pool / Getty Images)