http://news.bbc.co.uk/1/hi/health/4317529.stm

He said, that while most of the population was starting the recovery
process, at least 20% would have longer term mental health problems and 5%
of these would be severe, with people needing counselling for post traumatic
stress disorder and anxiety

People Who experience mood swings, fear,
voices and visions: each other on the internet
www.peoplewho.org