1 Centre for Suicide Research, University of Oxford, Department of Psychiatry, Warneford Hospital, Headington, Oxford, OX3 7JX, UK.
2 Centre for Suicide Research, University of Oxford, Department of Psychiatry, Warneford Hospital, Headington, Oxford, OX3 7JX, UK. Electronic address: keith.hawton@psych.ox.ac.uk.
3 School of Healthcare, University of Leeds, Leeds, UK.
4 Oxford Central Child and Adolescent Mental Health Services, Oxford Health National Health Service Foundation Trust, Oxford, UK.
5 Health Experiences Research Group, Nuffield Department of Primary Care Health Sciences, University of Oxford, and National Institute for Health Research Oxford Biomedical Research Centre, Oxford, UK.