This map was complied under contract by the EMCDDA with the objective to map questions from national General Population Survey questionnaires into a common database to promote further harmonisation with the European Model Questionnaire (EMQ). This work will inform and support subsequent combination of databases for common analysis. The main work, carried out from October 2010 to January 2011, was facilitated by regular communication and close cooperation with the Epidemiology Unit Project Team.
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