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WASHINGTON, DC - SEPTEMBER 28: HRH Crown Princess Mary of Denmark speak during a visit to Children's National Medical Center on September 28, 2016 in Washington, DC. (Photo by Riccardo S. Savi/Getty Images)

WASHINGTON, DC - SEPTEMBER 28: HRH Crown Princess Mary of Denmark speak during a visit to Children's National Medical Center on September 28, 2016 in Washington, DC.  (Photo by Riccardo S. Savi/Getty Images)

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WASHINGTON, DC - SEPTEMBER 28: HRH Crown Princess Mary of Denmark speak during a visit to Children's National Medical Center on September 28, 2016 in Washington, DC. (Photo by Riccardo S. Savi/Getty Images)

WASHINGTON, DC - SEPTEMBER 28: HRH Crown Princess Mary of Denmark speak during a visit to Children's National Medical Center on September 28, 2016 in Washington, DC.  (Photo by Riccardo S. Savi/Getty Images)

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WASHINGTON, DC - SEPTEMBER 28: HRH Crown Princess Mary of Denmark speak to children during a visit to Children's National Medical Center on September 28, 2016 in Washington, DC. (Photo by Riccardo S. Savi/Getty Images)

WASHINGTON, DC - SEPTEMBER 28: HRH Crown Princess Mary of Denmark speak to children during a visit to Children's National Medical Center on September 28, 2016 in Washington, DC.  (Photo by Riccardo S. Savi/Getty Images)

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WASHINGTON, DC - SEPTEMBER 28: HRH Crown Princess Mary of Denmark alongside hospital President Kurt Newman waves to a TV monitor during a visit to Children's National Medical Center on September 28, 2016 in Washington, DC. (Photo by Riccardo S. Savi/Getty Images)

WASHINGTON, DC - SEPTEMBER 28: HRH Crown Princess Mary of Denmark alongside hospital President Kurt Newman waves to a TV monitor during a visit to Children's National Medical Center on September 28, 2016 in Washington, DC.  (Photo by Riccardo S. Savi/Getty Images)