I think there are gaps because there has been so little research, so we don't know. If there were more funding to do research, a number of researchers would be happy to start working with all of these different areas and collecting objective data so that we could know the differences between them.
Again, if you're talking about stress physiology, both in treatment and in prevention, similar biological stress physiology patterns can be seen in all individuals, but targeted personalized intervention, I think, based on their particular display of symptoms, as Dr. Ferguson was saying, is critical. We'd need more research.