1. Tavistock Clinic; Child and Family Department; 120 Belsize Lane Hampstead London UK NW3 5BA
2. University of Leeds; School of Medicine; 5 Willow Avenue Leeds UK LS4 2HF
3. Institute of Psychiatry, Kings College London; Department of Child and Adolescent Psychiatry PO85; De Crespigny Park London UK SE5 8AF