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.
More top news
The biggest ever airlift of rescued lions, including Zeus and Shakira, will take place on Friday - involving 33 of the big cats.
British Summer Time may have begun weeks ago, but commuters in northern England and Scotland woke up on Friday to yellow warnings of snow.
Protests in California caused chaos in the streets outside a Donald Trump rally.