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Multicentre randomised controlled trial.
Follow up period:
Eight community based outpatient clinics, USA; enrolment 2001 to 2003.
445 outpatient currently using stimulants (cocaine, amphetamine, or methamphetamine), with self-reported or urine sample proven stimulant use in the two weeks after study entry. 30 participants were excluded from analysis for not meeting inclusion criteria.
All participants received standard care, as well as urine tests once to twice a week for up to 24 tests. …
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