Sir David Nicholson has signed a wall at an NHS conference to "pledge to become a dementia friend," someone who is trained to help spot the early signs of the disease.
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The President-elect was named Time's person of the year for creating a "Divided States of America".
Children and young people with terminal and life-limiting illnesses should be asked whether they have a bucket-list they wish to complete.
Warning lights and barriers were in place to warn drivers the bridge was closed but the band still drove through, an inquest heard.