1Research Dept., Barnet, Enfield & Haringey NHS
Mental Health Trust, Haringey NHS Teaching Primary Care
Trust, St. Ann’s Hospital, London N15 3TH, UK
2Dept. of Psychiatry & Behavioural Sciences,
Royal Free & University College London, Medical
School, University College London, London, UK
3Tavistock Clinic, London, UK
4Institute for the Study of Children, Families and Social Issues, Birkbeck, University of London, London, UK