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Mitcheson, L; McCambridge, J; Byrne, S; (2007) Pilot cluster-randomised trial of adjunctive motivational interviewing to reduce crack cocaine use in clients on methadone maintenance. European addiction research, 13 (1). pp. 6-10. ISSN 1022-6877 DOI: https://doi.org/10.1159/000095809 Full text not available from this repository.