Peter Fonagy1, Patrick Luyten2, Anthony Bateman3. 1. Research Department of Clinical, Educational, and Health Psychology, University College London, London, United Kingdom. 2. Research Department of Clinical, Educational, and Health Psychology, University College London, London, United Kingdom2Faculty of Psychology and Educational Sciences, KU Leuven, Leuven, Belgium. 3. St Anne's Hospital, London, United Kingdom4The Anna Freud Centre, London, United Kingdom.