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Stimson, Gerry V and Hickman, Matthew and Quirk, Alan and Frischer, Martin and Taylor, Colin, eds. (1997) Estimating the prevalence of problem drug use in Europe. Papers arising from a scientific seminar on addiction prevalence estimation: methods and research strategies held in Strasbourg, France, 10-14 June 1996. EMCDDA Scientific Monograph Series; No. 1 Luxembourg: Office for Official Publications of the European Communities .