1. Health Policy, Drug and Alcohol Research Centre, Middlesex University, London, UK
2. Drug and Alcohol Research Centre, Middlesex University, London, UK
3. Faculty of Health, Social Care and Education, Middlesex University, London, UK
4. Nursing, NMAHP Research Unit, Pathfoot Building, University of Stirling, Stirling, Scotland, UK
5. Renal Unit, Raigmore Hospital, Inverness, Scotland, UK