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Acknowledgements
• Leeds Addiction Unit clinical team for assisting in recruitment
• Leeds Addiction Unit patients for agreeing to complete questionnaires and
participate in interviews
• Roger Brearley, Robert Kenyon, Scott Payne for assisting in the follow-up data collection in the main study and Linda Handforth for assistance in distributing questionnaires in the validation study
• Ian Russell and David West for statistical advice
• Russell Hornshaw for guidance in computing
• Stephen Morley for supervision
• Griffith Edwards for discussions on the nature of dependence and encouragement throughout
• Duncan Raistrick for endless discussion, advice and constant support
To my father in memoriam
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