1 Assistant Director, Management of Addiction in Primary Care Programme, Irish College of General Practitioners, Dublin, Republic of Ireland doctordes@hotmail.com.
2 Senior Lecturer, School of Medicine, University College Dublin, Dublin, Republic of Ireland.
3 Professor of Urban General Practice, Department of Health Sciences, University College Dublin College of Health Sciences, Dublin, Republic of Ireland.
4 General Practitioner and Clinical Fellow in Social Inclusion, UL Graduate Entry Medical School, University of Limerick, Limerick, Republic of Ireland.
5 Professor of Public Health Policy and Practice, Liverpool John Moores University, Liverpool, UK.