3 Institute of Psychiatry & Department of Mental Health & Specialist Care, Florence Nightingale School of Nursing & Midwifery, Kings College, London, UK; sally.askey-jones@kcl.ac.uk.
4 University of East Anglia, Norwich, UK; Richard.Gray@uea.ac.uk.
5 Kings College Hospital, London, UK; esilber@doctors.org.uk.