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Williams, Hugh (2005) Service response to benzodiazepine use in opiate addicts: a national postal survey. Irish Journal of Psychological Medicine, 22, (1), pp. 15-18. https://doi.org/10.1017/s0790966700008739.

Williams, Hugh and O'Connor, John J and Kinsella, Anthony (1990) Depressive symptoms in opiate addicts on methadone maintenance. Irish Journal of Psychological Medicine, 7, (1), pp. 45-46.