Maybe just to add a little bit, this group at McGill, in partnership with a group at Harvard, has a large grant from the U.S. army to try to test this drug, this beta blocker, in the treatment of PTSD. Hopefully we'll have a response on a fairly large cohort of subjects very soon. That's coming.
In terms of head injuries, there's basic research and clinical research that has demonstrated strongly the link between head injuries and the incidence of Alzheimer's disease.