L Alexander1,2, J Lyne3,4. 1. Tallaght Adult Mental Health Services, Sheaf House, Tallaght, Dublin 24, Ireland. 2. Department of Psychiatry, Trinity College Dublin, Dublin 2, Ireland. 3. Royal College of Surgeons in Ireland, 123 St. Stephen's Green, Dublin 2, Ireland. 4. North Dublin Mental Health Services, Ashlin Centre, Beaumont Road, Dublin 9, Ireland.