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aSchool of Social Policy, Sociology and Social Research, European Institute of Social Services, University of Kent, Keynes College, Canterbury CT2 7NP, UK
bInstitute for Criminal Policy Research, King's College London, Strand, London WC2R 2LS, UK
cWODC, Ministry of Justice, P.O. Box 20301, EH 2500 The Hague, The Netherlands
dInstitut für Sucht – und Gesundheitsforschung, CH 8031 Zurich, Switzerland