The effectiveness and cost-effectiveness of diversion and aftercare programmes for offenders using class A drugs: a systematic review and economic evaluation oleh Karen P Hayhurst, Maria Leitner, Linda Davies, Rachel Flentje, Tim Millar, Andrew Jones, Carlene King, Michael Donmall, Michael Farrell, Seena Fazel, Rochelle Harris, Matthew Hickman, Charlotte Lennox, Soraya Mayet, Jane Senior, Jennifer Shaw