If they are not diagnosed early in life sometimes the consequences can be quite devastating.
We hope that this evaluation will provide valuable new insights making a big difference to the lives of a number of children and we value your support.
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The PM faces a countdown to settle a deal before her minority government tries to get its Queen's Speech plans approved by the Commons.
More details will come today on proposals to offer EU residents the right to a new "settled status" in Britain after it leaves the bloc.
Scotland and Northern Ireland could see rain later but for the rest of the UK it should be a fine day.