1. Department of Psychiatry and Mental Health Research & Education and Research Centre, St. Vincent's University Hospital, and School of Medicine & Medical Science; University College Dublin; Dublin 4; Ireland
2. Tyrone & Fermanagh Hospital; Western Health and Social Care Trust; Omagh; Northern Ireland
3. Department of Psychiatry; Queens University Belfast; Belfast; Northern Ireland
4. School of Public Health, Physiotherapy and Population Science; University College Dublin; Dublin 4; Ireland