AZONano -- Of the more than 1.5 million people who suffer a traumatic brain injury each year in the United States, as many as 75 percent sustain a concussion, a brain injury that is classified as mild yet can lead to long-term or permanent impairments and disabilities. A consortium of physicians and scientists in the Houston region is now undertaking a research initiative to improve diagnosis of mild traumatic brain injury (MTBI) and develop innovative treatment strategies.