1. BC Centre for Excellence in HIV/AIDS; Addiction & Urban Health Research Initiative; 611 Powell Street Vancouver BC Canada V6A 1H2
2. School of Medicine and Medical Science, University College Dublin; Coombe Healthcare Centre Dolphins Barn Dublin Ireland D8
3. National University of Ireland Galway; College of Medicine, Nursing, & Health Sciences, School of Health Sciences Galway Ireland
4. Faculty of Education and Health Sciences, University of Limerick; Centre for Interventions in Infection, Inflammation & Immunity (4i); Limerick Ireland
5. Faculty of Education and Health Sciences, University of Limerick; Graduate Entry Medical School; Limerick Ireland
6. Mid-Western Regional Hospital; Department of Paediatrics; Dooradoyle Limerick Ireland
7. National University of Ireland; Department of General Practice; No 1, Distillery Road, Galway Ireland
8. Health Service Executive; Addiction Services; Bridge House, Cherry Orchard Hospital Ballyfermot Dublin Ireland 10
9. Graduate Entry Medical School, University of Limerick; Statistical Consulting Unit/ Applied Biostatistics Consulting Centre /CSTAR; Limerick Ireland
10. UCD School of Medicine and Medical Sciences; Academic General Practice; Health Sciences Centre Belfield Dublin 4 Ireland