TY  - GEN
AU  - Hartnoll, Richard
AU  - Hendriks, Vincent M.
AU  - Orrival, Marc
TI  - The assessment of drug problems
PY  - 1998///
CY  - Copenhagen
PB  - WHO Regional Office for Europe
KW  - dataverzameling
KW  - drugs
KW  - epidemiologie
KW  - onderzoeksmethoden
KW  - registratie
ER  -