Comparative analysis of research into illicit drugs in the European Union : full report - Bühringer, Gerhard; Farrell, Michael; Kraus, Ludwig; Marsden, John; Pfeiffer-Gerschel, Tim; Piontek, Daniela; Karachaliou, Krystallia; Künzel, Jutta; Stillwell, Garry (Directorate-General for Justice, Freedom and Security of the European Commission, 2009)