temps (durée) (1) littérature (1) laboratoire (1) information (1) analyse (1) gaz (1) équipement (1) comparaison (1) substance chimique (1) analyse chimique (1) adulte (1) abords (agglomération) (1) Drug use (1) Context (1) Comparison (1) Surveys (1) Programs (1) Needle exchange programs (1) Week (1) Time (1) Syringes (1) Surveys (1) Substance abuse (1) Self-evaluation (1) Self (1) Questionnaires (1) Persons (1) Methamphetamine (1) Markets (1) Human beings (1)