RT Article T1 Estimating the number of Heroin users: A review of methods and empirical findings from the Netherlands JF International journal of the addictions VO 29 IS 11 SP 1393 OP 1417 A1 Korf, Dirk J. A2 Reijneveld, Sijmen A. 1960- A2 Toet, Jacob LA English YR 1994 UL https://krimdok.uni-tuebingen.de/Record/1639445528 K1 Heroinabhängige K1 Häufigkeitsschätzungen K1 Methoden