This is a list of resources which address Traumatic Brain Injury.
The following PDF provides statistical information on the extent of brain injury in Canada and its associated costs:
This PDF booklet from the U.S. Centers for Disease Control (CDC) provides information on concussion and brain injury:
It is difficult to convey the experience of brain injury to those who have not experienced it. One of the better communications is from the New York State Office of Mental Health and an excerpt is found here:
My own experience is described in this post: