TY - GEN ED - European Monitoring Centre for Drugs and Drug Addiction [EMCDDA] TI - Guidelines for the evaluation of treatment in the field of problem drug use : a manual for researchers and professionals T2 - EMCDDA manuals SN - 9291682799 PY - 2007/// CY - Lisbon PB - EMCDDA KW - drugs KW - evaluatie KW - hulpverlening KW - onderzoeksmethoden KW - richtlijnen ER -