If they are not diagnosed early in life sometimes the consequences can be quite devastating.
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Speaking as a Scot - not the ITV News Scotland Correspondent - I am feeling a great anxiety about what lies ahead.
For many of us it has felt more like late summer than earlier autumn. But expect some misty, low cloud hit eastern counties tonight.
ITV Border's Political Editor Peter MacMahon on whether or not Scots have decided to end more than three centuries of history.