[1] Univ Oxford, Warneford Hosp, Dept Psychiat, Oxford, England
[2] Univ Oxford, Dept Publ Hlth & Primary Care, Oxford OX3 7LF, England
[3] Tavistock Clin, London NW3 5BA, England
[4] Royal Free & Univ Coll, Sch Med, UCL, Leopold Muller Ctr Child & Family Mental Hlth, London, England
[5] Mental Hlth Grp, Southampton, Hants, England
[6] Univ Oxford, John Radcliffe Hosp, Dept Paediat, Oxford OX3 9DU, England