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Strang, John, Janie Sheridan, Claire Hunt, Bethanne Kerr, Clare Gerada, and Michael Pringle. The Prescribing of Methadone and Other Opioids to Addicts: National Survey of GPs in England and Wales. Oxford University Press, 2005.

Strang, John, et al. The Prescribing of Methadone and Other Opioids to Addicts: National Survey of GPs in England and Wales. Oxford University Press, 2005.